Google Ads Strategy for Series A and B Startups

You just raised your Series A or B. The board wants growth. Your CEO wants revenue. Your VP of Marketing wants pipeline.

Google Ads is one of the fastest ways to generate demand — but it’s also one of the fastest ways to burn cash if you do it wrong.

Here’s how to approach it strategically.

Start with unit economics, not budgets

Before you spend a dollar, answer these questions:

• What’s your target CAC? If you’re B2B SaaS with $50K ACV, you can afford a $5,000 CAC. If you’re selling a $29/mo tool, you probably can’t afford more than $150.
• What’s your conversion rate from lead to customer? If 10% of demo requests become customers, you need your cost per demo under $500 to hit a $5,000 CAC target.
• What’s your LTV:CAC ratio? At Series A/B, investors want to see 3:1 or better. Build your ad budget backward from this number.

Most startups skip this step and set an arbitrary monthly budget. That’s how you end up spending $30K/mo on Google Ads with no idea whether it’s working.

Which campaign types to start with

Search campaigns (start here)

Search captures existing demand — people actively looking for your solution. This is where you get the fastest signal on whether Google Ads works for your business.

Start with:

• Branded campaigns: Protect your brand name from competitors bidding on it. Low cost, high conversion rate.
• High-intent keywords: “[Your category] software,” “best [solution] for [use case],” “[competitor] alternative.” These are people ready to evaluate.
• Problem-aware keywords: “How to [solve the problem your product solves].” Lower intent but often lower CPCs.

Performance Max (add at $10K+/mo)

Performance Max uses Google’s AI to serve ads across Search, Display, YouTube, Gmail, and Discover simultaneously. It works best when:

• You have strong conversion data (50+ conversions/month)
• You’ve provided high-quality creative assets
• Your landing pages convert well

Don’t start with PMax. Add it once you have a baseline from Search campaigns.

Remarketing (add immediately)

Set up remarketing from day one, even if you start small. It costs very little to retarget website visitors, and the conversion rates are dramatically higher than cold traffic.

YouTube and Display (use selectively)

These are awareness channels, not demand capture. Use them for:

• Retargeting (video testimonials to people who visited your pricing page)
• Competitor targeting (showing your ads to people watching competitor content)

Don’t use them for cold prospecting until your Search campaigns are profitable.

Common mistakes startups make

Mistake 1: Spending too much too fast

VC money creates pressure to “scale.” But scaling Google Ads before you’ve found winning keywords, audiences, and landing pages means scaling waste.

The fix: Start with $5K–$10K/mo. Find what works. Then scale aggressively once you have profitable campaigns.

Mistake 2: Optimizing for clicks instead of revenue

Clicks mean nothing. Conversions are better. But revenue is what matters.

The fix: Set up offline conversion tracking. Import your CRM data (closed-won deals, pipeline value) back into Google Ads so the algorithm optimizes for actual revenue, not just form fills.

Mistake 3: Ignoring landing pages

You can have the best ads in the world and still lose money if your landing page doesn’t convert. Most startups send ad traffic to their homepage, which is designed for brand storytelling — not conversion.

The fix: Build dedicated landing pages for your highest-spend campaigns. Test headlines, CTAs, social proof, and page structure.

Mistake 4: No negative keyword strategy

Without negative keywords, you’re paying for searches like “free [your category],” “[your category] jobs,” and “[your product] login.” This waste compounds over time.

The fix: Review your search terms report weekly. Add irrelevant terms as negatives aggressively.

Mistake 5: Delegating to a generalist

Your growth marketer is talented, but managing Google Ads well requires deep specialization. It changes constantly — new campaign types, bidding strategies, audience signals, and algorithm updates.

The fix: Get a specialist. Either hire one (expensive — see our in-house vs. agency comparison) or work with a focused managed service.

What a good first 90 days looks like

Week 1–2: Account audit (or buildout), conversion tracking setup, keyword research, campaign structure, initial ad copy.

Week 3–4: Launch campaigns. Monitor daily. Aggressive negative keyword management. First round of ad copy tests.

Month 2: Analyze initial data. Kill underperforming keywords and ads. Double down on winners. Begin landing page optimization. Add remarketing.

Month 3: Expand to adjacent keywords. Test Performance Max if conversion volume supports it. Establish baseline KPIs and create a scaling plan.

By the end of 90 days, you should know your true CAC from Google Ads, which campaign types and keywords drive real pipeline, and what it will cost to scale.

Getting started

At SemGuns, we work with VC-backed companies every day. We understand the pressure to grow fast — and the importance of doing it efficiently.

$999/month or 10% of ad spend. No setup fees, no long-term contracts. We’ll have your campaigns optimized within the first week and show you measurable improvement by month two. Book a 15-minute intro call.