You can be an enchanter in either city... Now when you hit 20 you'll either upgrade to an Illusionist, or a Coercer. Illusionist if you are good, Coercer if evil. If you started evil, and wanted to become an Illusionist you would have to partake in the betrayel quest. If you are looking to become a Coercer then you don't have to worry about that, you'll be fine in Freeport.