Where can i search for jobs in Toronto?

I am an immigrant, living in Toronto. I am looking for job in Toronto. I worked as a lecturer in a collage and have few more work experiences as a Technical staff and as a tester - all before coming to Canada. Now, I do not know where to start with or whom to contact for a job in Toronto. Is there any place/organization that can help people like me? Appreciate all help on this regard. Thank you.