Tips:
If you want them to live together without injuries or reproducing, they should all be neutered/spayed.
If you get bunnies that are all supposed to be the same gender, and you want to let them grow up a bit before neutering, check genders regularly (maybe every month or so) in case whoever sexed them the first time made a mistake. Hopefully you can catch it before they are old enough to produce an unexpected litter. (If you do find an unexpected litter: be ready for another one a month later. The buck probably rebred the doe as soon as she finished giving birth, before you even saw the first litter.)
Water is very important, both in hot weather and in below-freezing weather. In winter, water bottles (the kind with a little spout and a ball) are a very bad choice, because the ball freezes so fast. No matter how much water is inside the bottle, it does the rabbits no good when they cannot get it.
Rabbits sometimes dump their water dishes, or sit in them. LARGE dishes make this less of a problem-- my favorite dishes held over one quart of water, which made them difficult to dump, and unpleasant to sit in. It also meant they took a longer time to freeze than small dishes, so the rabbits had water available longer. Heated dishes would also help in winter, but be careful that the rabbits cannot chew on the cords.