Ill upload some pics later. But this is how it goes.
Mage->Sorcerer
Warrior->Warlord
Rogue->Renegade
Healer->Acolyte
you can get these other classes by doing the trainer quests. in Battleon up one screen, right one screen, and up into the building. they will all be standing there with quests. Once you finish all the quests you will have the option to buy the next armor upgrade. Happy hunting!
P.S. The snails are in Willow Creek in the back yard of the Eastman's house.