This is Melissa Kaplan's website. It has been around for roughly 10 years or so, and it has been the staple website for iguana care. It has a ton of information, and if you can print it all out, even better!
Homepage:
http://www.anapsid.org/
Iguana Care:
http://www.anapsid.org/iguana/icfs/index.html
In addition, she wrote the book "Iguanas for Dummies" of the "For Dummies" series. It is basically a repetition of the website, with some extras and a few updated infos. Excellent book, and very affordable.
James T. Hatfield also wrote an excellent book: "The Ultimate Iguana Manual". This is my favourite of all, and although more expensive, it is well worth the price tag.
In addition, skim through this message board, look also at past pages, and you'll see lots of questions people have asked that you may be interested in! And remember, there are no such things as stupid questions, so feel free to ask lots here.
A visit to the vet should be among your first things to do.
And remember, it's an iguana, so when it comes to housing it, thing BIG! Good luck!
-IJ