Hi Rana,
Initially you should find a basement to save money because finding a job here is not easy. You need to make contacts/references first and it takes time. Basement rent here is from $600 - $900 and appartment rent from $850 - $1200 depending on the location/space etc.
I found getting an office job very difficult but not impossible. If someone has Canadian work experience and Canadian education he/she will find a job quickly else you need to start with any odd job (need references as well) to cover your necessary expenses and start studying part time.
First thing to do after landing is to get the driving license, go to Govt. office (YMCA) to get help in writing your resume as per the Canadian standards, improve interview skills etc etc and go and register with some employment agencies like kelly services, The bagg group, etc (you can google to find a list of all).
Best of luck to all
Muneer