Here are two articles I find that give us some info what need to be done in Legions in order to open up access to better gear, and level up our class hall and artifacts.

http://www.pcgamesn.com/world-of-warcraft/...gion-gear-guide

http://www.worldofmoudi.com/class-order-hall-missions-guide

If you have other information that is useful to maximize our progression, please share here as well.