I don't know if a PGCE is a teaching certificate or not, but before you make any plans on teaching, you had better have your qualifications evaluated by the Province of Ontario to make sure you're qualified. Then, if they do qualify you, you can apply for registration -- but once you're registered, teaching jobs are very difficult to find. I know Canadians who couldn't even get work as supply teachers, and would do part-time construction to survive. Ottawa is one of the most desirable places to live; it will not be easy to break in there. If you're willing to live in a remote First Nations community, it will be much easier to find work.