Winning an iguana at the fair is never a good idea. Who would give out a prize like this? With that said, it's not your fault and I'm glad you are there to take care of it. This looks like a very young one. When they are adults the can grow to a length of over 6 feet. They can also live into their teens. Are you prepared at all for a large lizard that will be around that long? They love to climb and I've seen people with plastic shelves set up by the windows for them to louge around on which they seem to love. Since they need so much room its not always practical to build a big cage when they can have the run of a good window seat. You need a cage for when you are gone and during the night but other than that they do good with the run of a room in the house. I know head lettuce is not a healthy diet for iguanas and that vitamin supplements should not be given- only calcium an some D3, as supplements can be harmful to them. I can't think of much else right now. Got a name picked out yet?