Why

At 10–50 inquiries/month spread across referrals, phone, web form, and email, with 4–10 people who can all touch a deal, you have no single place where a lead exists. Referrals especially die in DMs and forwarded emails because nobody owns them. You're not drowning yet — which is exactly why now is the cheap moment to install the habit, before launch traffic turns a 30/mo trickle into a 150/mo problem you're firefighting.

What you actually need

1. HubSpot Free CRM (free for unlimited users) — connect your team email inboxes and the web form directly. Every inquiry auto-creates a contact with source tagged. One pipeline: New → Qualified → Scoping → Proposal → Closed.
2. A shared inbox rule for phone + referrals — anyone who takes a call or gets a referral DM creates the contact in HubSpot within 10 minutes, owner = themselves. No exceptions, including the founders.
3. A habit — the 9am standup pipeline scan — 10 minutes daily, walk the board, anything with no next-action date gets one assigned or killed.

Do this today

Go to hubspot.com → sign up for the free CRM → Settings → Marketplace → install the Gmail/Outlook extension on every team member's inbox, then Marketing → Forms → embed the HubSpot form on your site (or connect your existing web form via the Forms API). By tonight every web inquiry and every email reply lands as a contact record with an owner field, instead of dying in someone's inbox.

What to ignore

Skip HubSpot Sales Hub Professional ($100/seat/mo), Salesforce Starter, and Apollo/ZoomInfo entirely — at pre-launch with <50 inquiries you do not need sequences, forecasting dashboards, or a data enrichment bill. Ignore anyone pitching you "AI CRM for AI companies" — the irony tax is real and the free tier does everything you need for the next 12 months.

What doing nothing costs you

At 4–10 people touching leads with no system, expect 20%+ slippage on referrals alone — the highest-intent channel you have. For an AI software agency where one referred deal can be $30k–$100k+, losing two a quarter to "I thought you were following up" is the entire cost of your sales ops for a year.

Where this leaves you

You've got HubSpot Free, one pipeline, and a daily scan. The plan configures the five stages for your specific deal types (discovery vs. build vs. retainer), schedules the rollout across your 4–10 team in the two weeks before launch, and names the moment in week two when half the team stops logging calls because "it was just a quick chat" — that's when adoption dies in agencies your size.

When to revisit this

When you cross 100 inquiries/month or hire a dedicated salesperson — that's when HubSpot Sales Hub Starter or Pipedrive Advanced earns its keep.