Please refer to the Fact Sheet on our site entitled "Before You Rent ..." at https://landlordselfhelp.com/media/Before-You-Rent.pdf . This Fact Sheet provides a general outline on the steps to take before renting.  You should also visit www.secondsuites.info for a variety of helpful information including a very useful Operating Guide.
You will also find a lot of information for landlords on the Canada Mortgage and Housing Corporation website at https://www.cmhc-schl.gc.ca and also the Landlord and Tenant Board's website at https://tribunalsontario.ca/ltb/forms/