a stock android ROM (recommendations?)?

I've searched, but not found anything that can handily take me from having a rooted 14.3.2.6 HDx 8.9 (Apollo, right?) to a ROM. There's so much confusion about downgrading to an earlier version (for what?), having/not having safestrap, having TWRP, etc.

Anyone got a place where I can simply follow a 1-2-3 guide to go from root to ROM? Thanks!