Hi, if you're planing to open it on your own there isn't any space requirement, but obviously children need enough space for their activities. Just make sure the rooms used for the daycare in your home are childproof. Pay attention on the kitchen area (cabinets, stove, cleaning supplies, etc)

Go online a get more information about childproofing your house there are also lists. It is good you have a big back yard but, you also have to think that during winter you will stay indoors when the weather gets harsh. Visit pinterest and youtube, there are great ideas on how to organize or use storage for a daycare in a house.

About the sleeping space, because you're on your own there isn't any regulation but, agencies encourage children should sleep on the main floor and all together (using cots or playpans); that is also easy to arrange in your home or the bedroom you're planing to use for naps, this room should also be childproofed. Try to connect with other caregivers and if you're in Ottawa we also have Ccprn.com visit the website it will also help.