I dont know if this has been posted before, and im not guna lie, im too lazy to check. But anyway, here is an awesome guide that I used when making my twinks that really helped me and is pretty much the best 19 twink guide ive ever seen.
WoW Forums -> Level 19 Twink Information (Recompiled)
This guide is by Jesus, now Jessus, whos was and I think still is a member of the < Original Outriders > who are the best twink guild in the game.
All credit goes to him, this guide is 100% Complete.