Kids

Any one know anything about twins? im trying to learn as much as possible. I have twins on the way. Any good books to read. There is not much on the internet about raising twins. A friend of my mothers told me to have them sleep in the same crib when they are younger. Any input on that? I also have two older kids. Well they're not that old they are both under 8. So far the oldest is ok with having another kid in the house, but the little one is not she's already jealous. Anyway any advice will do.