If you operated out of your home the rules would be the same for home daycare. Your home would have to pass the licensing requirements which it likely would not in terms of first zoning from your city from residential to business then things like a sprinkler system, industrial style kitchen, child size bathrooms, qualifications for staff, etc.
Also considering full day kindergarten doubt your plan would work anymore since kids are in full day school from 3 1/2 on. You might get some parents but most would need their child in care the full day.
You might want to consider working in a program that already exists such as through the early years centre or throuh a local church. A private school may be interested in adding a preschool component to their program. If you can piggyback off another organization you will be able to start up sooner.