Hi Sid!
Changing roles affects how you learn. You can continue to learn spells from a previous character type but at half their level. Best rule of thumb is to leave magic users in the class they currently are until they reach about level 14 and have learned all the most important spells available before switching them to another class.
For the non-magic users you can change classes much sooner with no difficulties.
Check the BEST TIPS thread for more hints on developing a character!
Wyv
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