The first 90 days with a new retainer client set the tone for everything that follows. Get them right and you build a relationship that compounds — the client trusts your judgment, gives you access to what you need, and stops second-guessing every recommendation. Get them wrong and you spend the next year recovering ground. At Choco Media, we’ve refined our agency client onboarding plan across enough retainer relationships to know exactly what to do in each phase — and what to skip.
This post is a phase-by-phase breakdown of the first three months. It’s a working template we use internally, shared here with enough detail that you can adapt it to your own retainer structure. Whether you’re running a content retainer, a paid media engagement, or a full-stack marketing partnership, the underlying rhythm is the same.
Why the First 90 Days Deserve a Real Plan
Most agencies treat onboarding as an administrative task: sign the contract, collect the brand assets, get access to the ad accounts. That’s the minimum. What it misses is that the first 90 days are when the client forms their mental model of how working with you actually feels. Are you proactive or reactive? Do you communicate clearly or go quiet? Do you make decisions or always ask for approval?
Those impressions stick. A client who spends the first month chasing you for updates will never fully trust you — even if the work is good. Conversely, a client who sees you operate with calm competence from day one will give you more latitude, more access, and more patience when things occasionally go sideways.
- The first 90 days build the working relationship, not just the deliverables
- First impressions in agency work are slower to form but harder to reverse than in other service relationships
- A documented plan means nothing falls through the gaps during a busy period
- It also signals to the client that you operate with discipline — which is itself reassuring
What “onboarding” actually means
We define onboarding as everything that happens before the work is fully in rhythm. That includes the knowledge transfer, the tooling setup, the first deliverables, and the first real feedback loop. It ends when both sides feel like the relationship has a cadence — not when the contract starts.
Days 1–10: Foundation Sprint
The first ten days are about reducing uncertainty on both sides. The client has just committed a meaningful budget; they want to feel like it was the right decision. You have just inherited a new context; you need to understand it well enough to work in it.
What we do in days 1–10
- Kick-off call (day 1–2): 60–90 minutes covering business goals, current marketing state, competitive context, and what success looks like at 90 days. We send an agenda in advance and a summary within 24 hours.
- Access and tooling (days 1–5): Ad accounts, analytics, CMS, brand assets, existing content library, any relevant data sources. We send a single access checklist rather than asking piecemeal.
- Stakeholder mapping (days 1–5): Who approves what? Who’s the subject matter expert for content? Who do we not contact directly? Getting this wrong early is expensive.
- Baseline audit (days 3–10): We do a quick diagnostic across whichever channels are in scope — usually paid media, SEO, and content — and document what we find. Not a full audit; enough to know where we’re starting from.
We send a 90-day plan document at the end of week one. It covers what we’ll focus on in each phase, how we’ll communicate, and what we need from the client to hit the milestones. Clients consistently tell us this is the moment they relaxed — not the contract, not the kick-off call, but the plan.
What we don’t do in days 1–10
We don’t make major changes. No restructuring campaigns, no rewriting copy, no changing landing pages. The first ten days are diagnostic. Acting before you understand the context is how you break things that were quietly working.
Days 11–30: First Deliverables and Feedback Loop
The goal of month one is to produce one thing that the client can see, respond to, and feel good about. This is partly psychological — retainer clients sometimes experience a gap between signing and seeing results — but it’s also practically important: you need early feedback to calibrate your understanding of their preferences and standards.
- Choose a deliverable that’s genuinely useful, not just fast — a campaign brief, a content strategy, a landing page recommendation
- Share it as a draft first, not a finished piece. Iteration is a feature, not a weakness
- Hold a review call on the draft, not just an email exchange — you learn more from hearing how they respond than from written comments
- Document any feedback that reveals a preference you didn’t know about
Communication rhythm
By day 30 we want a communication rhythm established and agreed. In most of our retainers that means a weekly async update (written, not a call) and a monthly check-in call. We use a Friday digest format for the weekly updates — a short structured summary of what moved, what’s next, and any decisions needed. This keeps the client informed without creating unnecessary meetings.
For clients interested in how we structure these updates, our post on bespoke retainer partnerships covers the communication frameworks we use across different engagement types.
Days 31–60: Getting into Rhythm
Month two is where the actual work starts to compound. The baseline is established, the first feedback loop has happened, and both sides know enough to move faster. This is also when the gaps in your initial understanding become visible — which is fine, as long as you surface them rather than hoping they’ll resolve themselves.
What changes in month two
- Cadence tightens: Deliverables start flowing more regularly. The client should be able to predict what’s coming each week.
- You start making smaller decisions independently: Not strategy changes, but execution decisions — ad copy variants, content topics, channel-specific optimisations. You brief the client after, not before.
- Data starts to accumulate: By week 6–8 you usually have enough to draw early conclusions. Share them, even if preliminary.
- Relationship depth increases: You’ve had enough contact to know the client’s communication style, their risk tolerance, and what makes them nervous. Use that knowledge.
The 30-day review
At the end of month one (or early in month two) we run a structured review: what was planned vs. what happened, what we learned, and what adjustments we’re making to month two. This isn’t a performance review — it’s a calibration. Framing matters. We present it as “here’s what we’ve learned and how we’re adapting” rather than “here’s our report card.”
Our post on how we onboard a new client in 14 days covers the early-phase access and tooling process in more detail if you want to go deeper on the operational side.
Days 61–90: Proving the Model and Setting Up Month Four
By day 60, the relationship should have a working rhythm. Month three is about deepening the work and preparing for what comes after the initial 90-day period. Most retainer relationships either strengthen or start to drift around this point — how you handle month three often determines whether you keep the engagement.
- Start delivering work that couldn’t have existed in month one — work that required the accumulated context, data, and relationship
- Identify the highest-leverage opportunities you’ve found and propose one substantive initiative for month four or five
- Document what’s working so it’s repeatable without relying on your memory
- Start preparing the 90-day review
What “high leverage” means at day 60
By this point you know enough to see opportunities the client may not have noticed. A landing page that’s converting at half the rate it should. An audience segment in the ad account that’s outperforming but underfunded. A content gap that’s leaving search traffic on the table. Calling these out — specifically, with data — is what separates a strategic retainer partner from a delivery team.
The 90-Day Review
The 90-day review is a formal checkpoint that we run with every retainer client. It’s different from the monthly check-in: it’s longer, more strategic, and explicitly designed to decide what the next 90 days look like.
What we cover
- Progress against goals: The goals set in the kick-off call. What moved, what didn’t, and why.
- Learnings: What we now know that we didn’t know on day one — about the market, the audience, the product, the client’s organisation
- Adjustments: What we’re changing in scope, approach, or channel mix based on what we’ve learned
- Next 90 days: Proposed focus areas, any scope changes, and the metrics we’ll use to measure them
We send the deck at least 48 hours before the call so the client has time to read it. The call itself is a conversation, not a presentation.
Practical Template: Phase by Phase
Here’s the condensed version of our agency client onboarding plan, formatted as a reference you can adapt:
Phase 1 — Days 1–10: Foundation
- Day 1–2: Kick-off call + summary sent
- Day 1–5: Access checklist sent and fulfilled
- Day 1–5: Stakeholder map documented
- Day 3–10: Baseline audit across in-scope channels
- Day 7–10: 90-day plan document shared
Phase 2 — Days 11–30: First Deliverables
- First substantive deliverable shared as draft
- Draft review call
- Communication rhythm agreed and started
- Client preferences documented
Phase 3 — Days 31–60: Rhythm
- 30-day review (calibration, not report card)
- Cadence operating independently
- Early data shared and discussed
- Smaller execution decisions made independently
Phase 4 — Days 61–90: Deepening
- High-leverage opportunity identified and proposed
- Work reflects accumulated context
- Documentation of repeatable processes
- 90-day review prepared and delivered
The Mistakes That Derail the First 90 Days
We’ve seen enough retainer relationships to know the failure modes. Most of them aren’t about the quality of the work.
- Overpromising in the proposal: The 90-day plan will expose any gap between what you promised and what you’re delivering. If the proposal was optimistic, address it directly on day one rather than hoping the client doesn’t notice.
- Going quiet after kick-off: Clients interpret silence as inactivity. Weekly async updates prevent this without requiring weekly calls.
- Making changes before you understand the context: Particularly relevant in paid media — we’ve seen agencies pause campaigns that were quietly supporting conversions elsewhere in the funnel. Audit before you act.
- Treating onboarding as a one-time event: Onboarding is really the first 90 days of relationship-building. It doesn’t end with the access credentials.
- Not documenting client preferences: Every time a client gives you feedback — on tone, on detail level, on how they like information presented — write it down. Don’t make them repeat themselves.
Scaling This Across Multiple Clients
If you’re running more than two or three retainers simultaneously, the discipline of having a documented onboarding process becomes essential rather than optional. Without it, new engagements get less attention than established ones, which is exactly backwards — the first 90 days is when the relationship most needs your focus.
We use a shared Notion workspace to track onboarding status across clients. Each client has a phase tracker, an access checklist, a preferences log, and a milestone calendar. When a new retainer starts, we copy the template and fill in the specifics. It takes about 30 minutes to set up and saves hours of coordination across the engagement.
For agencies thinking about how AI can help at this stage, our post on AI automation for marketing operations covers how we use automation in client-facing workflows without losing the human element that retainer relationships require.
Closing: The 90-Day Plan Is a Signal, Not Just a Tool
The reason we share our 90-day plan with clients in week one isn’t just operational. It signals something about how we work: we plan ahead, we communicate clearly, and we take the relationship seriously enough to document it. That signal lands before a single deliverable is produced.
If you’re building or refining your own retainer onboarding process and want to talk through how it fits with a broader agency structure, get in touch — we’re happy to share how we’ve adapted this framework across different engagement types.