Descenting is an option but not necessary. Intact ferrets have a strong musk aroma. When they're altered much of the odor disappears. Bathing too frequently will cause the oils to replenish and will cause more odor. Ask your veterinarian for any information they have on ferrets.
Ferrets are house companions.
There are several types of cages that can be used. Aquariums are not suitable for ferrets. Solid bottoms are better than wire. Whatever type of cage you use, there must be room for a litter box, sleeping box, food and water, and play area. Once your house is ferret-proof you can allow free access.