Angela's Rabbitry

has a great care section.

Here is a few answers to questions from their site.

How big should the pen be, and from what materials should it be made?
     Rule of thumb is that minimum pen space provided should be about 3/4 of a square foot per pound of mature weight. Therefore, a 10 pound animal would require a pen at least 30" x 36" (3/4 square ft x 10 pounds = 7.5 square ft. A pen 30" x 36" = 1080 square inches = 7.5 square ft.). Naturally a larger pen is not harmful, and how much larger is at your discretion.
     Building materials can vary from wood, to PVC plastic, to wire. The design of your pen is up to you, and how elaborate you wish to get. The basic pen is made of all wire, which is the most sanitary type of pen, as the waste from the rabbit will fall through the wire floor onto the ground or into a pan which might slide out from under the pen. This latter method is a great space saver, as pens can be stacked on top of each other, with the sliding pan stopping any waste from falling through to the pen below.

Should my rabbit be kept inside or outside?
     It is your choice whether to keep your rabbit inside or outside. Rabbits can adapt very easily to environment and conditions. However, it should be kept in mind that they need to be protected from the elements at all times. They should not be kept anyplace where they would be in a direct draft, come into contact with rain, snow, etc., nor should they be kept where they would be in the direct sunlight. Rabbits are wearing a fur coat, so they can withstand colder temperatures much better than they can withstand heat.
     If kept outside, it is good to envision how you will protect the animal from the elements before obtaining it. Building or purchasing a pen that will provide the necessary protection from the elements should be first and foremost in planning for your rabbit.

Can I keep 2 or more rabbits together?
     Rabbits are very territorial, and in most cases, if multiple rabbits are kept together they will end up fighting at some point. Normally, when reaching sexual maturity they may become aggressive and start positioning for dominance, which can lead to fighting. Rabbits are usually satisfied to be alone, and having a partner to live with is not necessary. Especially if you provide care and attention to the animal daily.
     There are, however, cases where multiple rabbits have been successfully kept together without fighting. If you wish to have more than 1 rabbit kept together, we suggest introducing them at a young age, keeping a close eye on them, and if one or more become aggressive, separate them at that time to prevent injury to any of the animals. 

Can I bathe my rabbit?
     If your rabbit has a soiled rear end, rinsing it off with clear water is clearly needed, but bathing the entire rabbit with shampoo is generally not advised. Rabbit fur will take several days to dry, resulting in a very uncomfortable rabbit when the entire rabbit is shampooed. Angora breeders will blow their show rabbits by using a hair dryer on cold or warm which blows out dirt and loose hair.

How do I worm my rabbit, and how often should this be done?
     The only worms rabbits get are pin worms which are thread sized, 1 inch long worms which can be seen protruding from the droppings. The common wormers used in dogs and cats, such as Pyrantal Pamoate (Nemex or Strongid), can be used at the dog dose, or in herd situations, Piperazine, a product sold for livestock which can be mixed in the water at livestock dosages, could be used. When pin worms are seen in one rabbit in a herd, treat the entire herd as the worm quickly spreads through the rabbitry. Worming once a week for 3 weeks is indicated to be sure all the immature forms are killed. Watch droppings closely as this proves that the worms are gone and have not come back.

What do I use for bedding?
     In solid bottomed cages, most use pine shavings. Cedar shavings have a resin which may be toxic. For wire bottomed cages, many rabbits will soil bedding, making more of a mess and creating more problems than it is worth. However where bedding is needed, straw especially in front of the feeder is best, leaving the back of the cage with bare wire flooring so urine and droppings can fall through. Plastic floor pieces ("Mighty Mat") are also useful for rabbits with feet problems.

What vaccinations does my rabbit need?
     Currently there are no approved vaccines for rabbits. There is no licensed rabies vaccine for rabbits so they should not be vaccinated for this. Even though this has been required by some fair shows, it has been associated with death of the rabbits.