Speak to Menara Voidrender in the Barrens.
[class]! Yes, you!
You don't have all the accoutrements, but it's plain to see you're ready--the air around you exudes greater confidence. Yes, I see it now.
Menara Voidrender would teach you a few things if you feel you're ready. She spends her time tutoring younger students in the arcane. She even gives gifts to those who pass her tests.
Go to Ratchet in the Barrens if you're interested. She's above the city in Strahad's tower.