i have a few pet iguanas i just got
Wow!  Those animals are amazing!  I have seen a few in the Caribbean.  I think I would have to get used to having something that big in MY yard!
actually these are not that big, they are sort of babies so I do not know how big they will get
Are they green iguanas?
yes, they are sort of greenish
The Green Iguana has become pretty popular in the United States in the last 20 years.  
I am a real novice, where do they originally come from?
They're native to Central America, South America, and the Caribbean, but have "traveled" to live in other areas.
do you know how long will they live? I may die before they do :)
I heard that they are hard to maintain but can live up to 20 years!