In the 'Books II' section of the forum, you should read two posts - 'Radagast, Alatar, and Pallando'and something like 'Curious about Wizards.'
If you need more, read the general Istari entry and the entries for each wizard in the Encyclopedia of Arda (http://www.glyphweb.com/arda/default.htm).
If what you're looking for is not in the books, nor any of what I've listed, feel free to ask for something else more specific, or as questions about particulars that are blurry.
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...take counsel with thyself, and remember who and what thou art.
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