Here you go OP.
1. Research what makes a good AR with respect to material, manufacturing, testing and track record. If you dont know what attributes make a good AR, you will spend money where you didnt need to for the sake of a roll mark, and you will over spend on parts that are crap, but looked friggin cool.
2. The barrel and bolt/BCG are the most important parts. If you are on a budget, dont scrimp on these two parts.
3. Find a manufaturer/builder who makes an AR that meets your needs and within your budget. I left manufaturer misspelled for the guys at FBT.
4. As you gain experience, make adjustments and additions as well as subtractions from the weapon.
5. Get quality instruction and shoot it. A lot.
I've tried and it seems that a lot of it gets lost in translation to me since, usually, I learn better by experience. It's a shame that you can't try out certain configurations and see what works and what doesn't.
Also, did you try to discreetly advertise FBT? xD