Best resource for learning Facebook Ads strategy?

So… I've got a lot of experience with creating ads, running them, targeting, etc. but I'd love to find a great resource that just teaches me the best strategy for correctly building the right variations of creative/targeting/etc.

My skillset can only take me so far, and then I kind of hit a wall. Basically this happens after I set up my first ads and audiences. I'm just kind of like… ok now what? I just bleed all this money out?

Thanks!