Yes, unneutered male rabbits, like cats, may spray. This one of the benefits of getting your boy neutered. Our domesticated pet rabbits are descendents of European rabbits and are a different species than the wild rabbits you see outside. Baby bunnies should not leave their mother until they are eight weeks old. They typically stop nursing about 6-7 weeks of age.
Most rabbits are happier when they live with a mate.
Then they must be introduced gradually. Wood stove pellets make an excellent litter. They are reasonably priced and do a good job controlling odor. Rabbits should be fed timothy hay, or another grass hay such as orchard grass. Legume hays, which include alfalfa, are too rich in calcium and too high in fat.