Quick Arcane Mana farming tip - The city of Suramar has items that give WAY more Arcane Mana than the stuff outside the city. The highest concentration of them I've found is in the Elite mob area, just west of the Sanctum of Order (?). With a team of 5, the elites are no challenge. I can get from 0 to 2000 quite fast there. If you have unlocked flying, even better. =)