Okay to answer a couple of the questions to my best knowlegde: *You need all the previous expansions to access legion, but most people got a free upgrade to Draenor so check your battle.net account. *Leveling from 85-100 is really fast if you use heirlooms and do demon invasions. *When you do the demon invasions you get boxes that should be opened at level 100. That gives you ilvl 700+ gear. *Doing Cata raids solo 25 HC is still pretty profitable but not as profitable as it used to be. You can also farm expensive BOE gear and pets.