Well, you'll start out level 1, so you'll have to start as either a fighter or a wizard. Experience to next level is calculated by adding your level in each of your classes together, then adding any level adjustment from race. In D&D, that final level number is called character level.
So, you'll have to start as either CG elven fighter or CG elven wizard, then multiclass later. Since wizard is a perfered class for elves, you won't have an XP penalty if the levels are to far apart. (Side note: I'm thinking of throwing perfered classes for races out, as well as XP penalties for differences between class levels, so if you want to yell about it, you won't have to yell much.
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The SRD I linked to should provide all you need. (Side note: Add the SRD to the list of things that you can use anything from, since I have it.)
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