Follow the workflow I use in practice as a freelance ads manager, with the templates and cheatsheets to get you there.
I'm a freelance PPC specialist running Hungry Bear Digital from Southeast Asia. My clients are in the US, UK and Asia, all of them lead gen for high-ticket services, local and national. That's all I do. I'm in Ads Manager most days.
Before freelancing I spent 10+ years as a marketing manager in the US, China, Korea and Australia. So I've been on the other side of the agency relationship, trying to work out whether the numbers I was shown were any good.
This is what I actually run with paying clients. No income claims, no overnight-results promises. Just the mechanics, and the mechanics are learnable in an afternoon.