Welcome to the board, kondrix!!!
One of the great things about W&W is the flexible character development! You can be all the classes but as Willow said, you cannot go back to a class you have been (unless you reset the adventures, then the history of what classes you have been disappears and all that remains is the class your character currently is).
Do remember to get the high level spells before changing class. You don't need all the spells and some aren't worth getting at all, but it's always wise to get all the spells you want for a particular class before changing to another that does not also learn that spell rhelm.
Wyv
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