wiring a computer fan is alot like wiring the lights... real simple...
buy a 12v AC power adapter
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then cut the end off and strip the wires from the computer fan and the AC adapter.....twist em up! (with most AC adapters you will be able to tell which is positive and which is negative, as you can see the ones from Radioshack are white and you can't tell)
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cap and wrap
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Just to make sure that the top doesn't fall off at any time, poke some holes around the edges so you can put pins in to secure everything together
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Thats it!
it should look something like this
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I hope this helps you guys out, now all thats left is.......