Here are some things you need to do when you let a rabbit out of its cage. Make sure you let them out to play for a couple of hours or more each day.
You need to rabbit proof (rabbits LOVE to destroy things!)
Cover or remove any electrical cords
Keep anything breakable out of your rabbit's reach
Block off any small spaces where they can get stuck
Block off or remove any wooden furniture, books, etc, that you would not want chewed
If you have carpet, always supervise your rabbit. Rabbits LOVE to eat carpet.
Be prepared to have to keep an eye on your rabbit. Rabbits will chew anything: doors, baseboards, walls, furniture, tv remotes, and anything else they can get their teeth on. So prepare yourself for a chewed-up room. I know from experience. Munchkin has already taken a few chomps our of a new tv stand, eaten two buttons off a remote, and tried to chew up some baseboards and some carpet. Fortunately, he usually doesn't ingest any of these things. Rabbits are fast. It only took Munchkin about two seconds while my back was turned to take the buttons off of the remote. And he had to jump up on the couch to get the remote. He loves the couch because he knows he isn't supposed to go up there.