#2 - Feb. 26, 2018, 12:12 p.m.
Hey Saraphen!
Indeed, characters that are level 60 or above before the boost is applied have their primary professions ranks set to 700 :)
If the character already has two professions, those will be leveled up. Alternatively, the game will automatically assign him or her two class-appropriate professions. The process is explained in more details on
this page.
With regard to the most lucrative careers, I would rather let other players provide you with additional feedback - I believe that you may benefit from a diverse range of suggestions! There are, however, a few time-tested combinations (Herbalism\Alchemy is the first that comes to my mind) that you would surely not regret choosing!
Take care!