Currently the raid is gearing up for The Emerald Nightmare.
At an absolute minimum we would ask all raiders to view the boss videos prior to raid. More research can be done at your own leisure and if we require specific strategies for our composition, those will be posted here.
For the first month of Legion until the raid tiers unlock we ask that you be setting aside time during the normal raid schedule to run dungeons and world quests with your teammates to get prepared for raid. Artifact power will obviously be very important as will your starting gear level.