I’d definitely do your market research. Find out what boarding facilities others offer nearby, their terms and conditions and their charges.
When you do get set up depending on your location you may need to notify your local council. You should notify your house insurers that you are running a business from home with members of the public coming on to your property. You will also need public liability insurance.
You need to give serious consideration to a formal contract for your clients to sign. This should cover a whole range of issues from cancellation fees, failure to collect on time or late collection fees, responsibility for vets fees, vaccination status (for rabbits) etc. I know of several businesses who have had issues with owners not paying bills, not collecting their pets and also with issues with vets fees.