Hah something WRONG with not keeping a rabbit cooped up? No of course not
Rabbits should be able to jump and run about, at the very least.
Chewing might be a problem when they're young. Spaying/neutering can help (and completely stopped spraying with my male rabbit too), and provide lots of things they CAN chew - my rabbit loves tea towels, cardboard boxes (big ones we cut a door out of and he can sit in and hide), kitchen roll tubes, plant pots (more for throwing than chewing) are my rabbits favourites, and of fruit wood is good for them to chew, there are lots of rabbit toys and things too but my rabbit turns his nose up at them a bit. We just made a loud clap or said "no" loudly when he chewed things he wasn't supposed to and he picked it up (well, he picked up not to chew them when we were looking anyway...).
I don't know about the fighting. I had two female rabbits, and one pretty much was dominant, and they nipped eachother a lot, but I never saw them fight.I was going to mention spaying though.
We give our rabbit a constant supply of actual hay, which is what is usually reccommended. It's good for them, and good for their teeth (and bordom!) to be able to have something to munch on. Our rabbit eats rabbit food, and fresh fruit and vegetables too to keep things interesting.
The only other thing I can think of is our rabbit had a cage with his litter, food and water in, and a basket with a blanket and toys. I think it's good to give them their own space they can feel safe in. He also really likes anywhere where he is covered from above, prefertably a box he can make his own exit holes in, and that's where he spends a lot of his time. Oh and we use cat litter in his litter tray, BUT some of them are not suitable for rabbits as they have small particles which can cause lung problems, so if you're doing the same only use ones that say "suitable for rabbits" or similar on them. Oh and when he was little he squeezed in places we never dreamed he would fit, and jumped on things we figured were far too high, so be careful and don't underestimate him!
Hope it all goes well.