If you've not started any of them for any of your specs, then you should find the starting quests in the Violet Citadel in Dalaran (near Khadgar). They're aptly named after your Talent Spec, so it'll be easy to figure out which is the most suited for you. If you've already started them, it'll be slightly harder to narrow down where you left of, but our fansite WoWhead can help with this guide that names all the quests per questline and talent spec: http://www.wowhead.com/empowered-artifact-traits-in-patch-7-2
Good luck!
Edited by Zaxithorne 09/04/2018 16:55