A green iguana was my first reptile! I kept her in a five foot two story self built cage. You will rarely find anything pre-made that will satisfy the requirements of an iguana from juvenile to adult. Mine loved to go to the bathroom in a big water tub. This also helped to keep the rest of the cage clean since I didn't have to "hunt" for "surprises". The best thing for them is the reptile carpet. Make sure it's actual reptile carpet and not the outdoor carpet because of the loops. The top floor was her basking bulb and uvb bulb. The bottom floor was her "cool" area and water bowl.
The best best best thing you can do it handle it as much as you can. Get it used to having it's feet touched because trying to keep their feet still while clipping those talons can be a challenge. I used to feed her her favorite treats outside of the cage when she was with me. This way she associated me with her favorite foods.
Try to vary their diet, a balance of veggies and fruit is always the best. Shedding can be tricky with all those spikes as it gets older. Not like a snake where it sheds all in one and need to make sure the spike shed from the base and isn't constricting blood flow. Also careful with the tail they do fall off!
The big thing is not to expect it to be tame. I have heard and seen ten Iguana horror stories for every one tame story. Truth is once they hit puberty they tend to do their own thing. I remember my forearms being scratched and welt marks from her nails and tail. I never was bitten, thankfully, but was a challenge.
Good luck with your new iguana. I am sure none of this was really new to you, however hope I helped some in anyway. I rescued mine and she was already an adult. However I would love to have another iguana if only I could get my girlfriend to go with it
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