Please read this:
About food: Your ig needs constant access to clean water. I keep mine in a cereal bowl. Your iguana must be offered a special diet that excludes any kind of animal content, and includes lots of greens. Animal protein and animal fat will kill him,, even though he passionately wants to eat crickets, meal worms, and cockroaches, mice, etc. These are feeder creatures sold to many people with carnivores and insectivores. You will learn more about that when you read the articles I posted for you.
During the near future, feed him chopped collard greens and grated butternut squash only, to keep it easy and safe. The squash is almost pure carbohydrates, but also have a lot of fiber to aid your ig's passing his stools. The collard greens have lots of nutrients and fiber. Read the feed/food article right away so you can fill out his diet with what's available at your local grocery store. BTW, frozen-thawed greens are virtually as good as fresh.
There are some veggies that look real good, but as is the case of Kale, none may be fed. Spinach is another, even though it is high in calcium. You will find out why. Both rob their diet of calcium.
New ig owners are curious about their new "pet'. So they often want to feed things they find in their yard or neighborhood, or non-approved food found in grocery stores. Do not do food experiments. They can poison your iggy.
If you don't know what his temperature must be, then start by heating the whole habitat to 85F until you read about it in the article. But do what you have to do to keep the night temperatures above 70F.
The special light he needs puts out UVB. There are lots of them on the market and through the Internet. There is a complicated chemical reaction in his skin to make a certain vitamin, which allows his body to utilize the calcium in his diet. Without it, his body will rob calcium from his bones to feed his nervous system. The results of consistent bone loss is Metabolic Bone Disease. It is very awful, and very easy to prevent.
So, I hope you do your reading. The topic of iguana care is way to large to convey in the Green Ig Society.
Happy Igging :-)