Newbie Guide:
Once you achieve a certain level of ability and experience you may advance to a higher class through the class transfer system.
To accomplish a class transfer you must fulfill a class transfer quest. These quests can be undertaken by characters of level 19 and above. After fulfilling the quest and achieving level 20 or higher, class transfer can be completed. At the time of class transfer you will choose one of many available professions. Once made, your decision is irreversible. Make your choice carefully.
I know all of the teachers in this area for any profession you might choose.
Human and Elven Fighters are trained by Grand Master Ramos of the Fighters Guild.
Human and Elven Mystics learn from High Priestess Levian at the temple. Dark Fighters and Dark Mystics go to Grand Master Xenos of the Dark Elf Guild.
Orc Fighters and Mystics are taught by High Prefect Osborn.
Dwarven Fighters train with Warehouse Chief Moke at his warehouse or Head Blacksmith Tapoy at his blacksmith shop.