@jonjojojon looks like you're a university student right now---make sure to pick up as many physics courses on electromagnetism as you can stand, because for anything beyond the simplest circuits, board design always all boils down to E&M optimization. Having a good intuition for the physics behind it is a supremely valuable skill.

For fabbing any prototype designs you make, I've heard excellent things about @oshpark . Next time I'm ready to order some boards, I'm definitely using them.