The Park Tool site is a good one, as is this one, and of course the incomparable Sheldon Brown. Just be forewarned, there are quite a few "specialized" tools that you will most likely be investing in shortly.
If you find you need replacement parts, you really can't beat the combination of ebay and a good LBS. Just make sure that on your disassemble, you take lots of pictures of anything you aren't positive you'll remember on the reassemble. I'm sure you'll be fine though, these things aren't rocket science!