I agree with the above poster, www.greeniguanasociety.org is an awesome place to look, as well as anapsid.org and Iguanas for Dummies. Also look into buying James Hatfield's book as well.
Myiguana.com, www.geocities.com/ig_chick/igdex.html, www.baskingspot.com/iguanas are also all great information resources.
Read, read, read!! Research a TON before you get an iguana. This is so important, the majority of people with iguanas didn't read up on them first, which can make for a very unhealthy little lizard 
Also, come back here and ask more specific care questions if you need help. This is a great place to get additional information to the stuff that's out there.
Good luck!
Wendy 

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"It's not a matter of IF...but WHEN" ~Bill Haast~
"Joy unspeakable...to be holding death in your hands..."