"what do i need and what are some good tips on how to raise them?
what are some good books or things?"

Great attitude...learning about whatever reptile you plan to keep can save a lot of heartache later on..

Iguanas For Dummies by Melissa Kaplan is a great book
http://www.anapsid.org/

http://www.greenigsociety.org/ is a fantastic website to get you started.

Iguana Den has a great site, too.

here are my three main questions at the moment:
"Do i start out with a big cage with a jouvenile?"
Opinions differ. I have a juvenile (5" snout to vent length) in a bigger cage. He spends his afternoons outdoors in a 4'x4'x3' wood frame mesh basking cage, and his indoor cage is 3'x3'x2'. Some people keep little ones in a large aquarium.


"How do i know which store has healthy iguanas?"
You just have to look at the iguanas and the general condition of the animals. Find one that is a healthy green color with no skin blemishes, broken toes, and doesn't have a pinched look to the end of the tail. Is it watching you or just lethargic looking? Sometimes you can find an adoptable iguana through a rescue or Craig's List.

"are they aggressive and if they are, can they be tamed?"
They will be flighty at first, but can be tamed. Breeding season brings out the beast, you know.

"also, what kind of accessories will they need and what brand of light works the best."
They need a suitable substrate for the floor, different levels of wide branches that are more horizontal than diagonally placed,a food dish, I have a little plastic shoe box for a pool. You can see what others use on different sites.

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