You must prove you have sufficient funds for all school + living expenses + return transportation to your country of citizenship. Cost of living can vary across Canada, and school costs can vary from school to school. Expect to need a minimum of CAD40,000/yr. Could run quite a bit more.
If you are not from a really cold climate (e.g. Norway, Sweden, etc.) expect to need a complete winter wardrobe. Clothing is expensive in Canada, and VAT taxes are very high (add roughly 20% to any costs quoted anywhere for anything). Expect to spend at least CAD5000 on winter clothes, if you buy only the essentials & get some things used from a thrift store.