Hey guys, I've been into BMX for quite a while now and i was wondering what parts exactly i would need to build a bike from scratch. I want to start to get into flatlanding so any suggestions on frames, anything at all, would help. Thanks!

P.S. I have $250-500$ to spend.

There's no way you will be able to build up any kind of decent bike for that budget. If you want to stick in that price-range, you are much better off buying a complete.

$250 gets you a good frame maybe. $500 gets you a frame(w/int headseat),bars and a stem.