I recommend getting a trueing stand and a wheel building book. Start with trying to build a wheel and you will learn a lot of how and why spokes/rims/nipples do what they do. If you just want some tips/info Sheldon Brown will be a help. Also, you could talk to your LBS. Some shops do give classes/demoes on how to do this. It takes time to master truing and building wheels. Practice makes perfect.
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