A first campaign is not a purchase, it is a measurement. Treat the first month as the price of finding out what works.
Three tests, two weeks each
Search, one social platform, and remarketing. Equal money, same landing page, different message.
Count calls, not clicks
Clicks are cheap to buy and easy to misread. Ask every caller where they found you, or use a separate number per channel.
Then double down
Whatever brought real conversations gets the second month. The rest is switched off without regret.