Canadian immigration is based on points system. You need 67 points to be eligible for the application. Please read more information at the link
http://www.cic.gc.ca/english/immigrate/skilled/apply-factors.asp If you have finished your Master degree in 17 years of formal education, then you will get 25 points. In my understanding the Master degree in Pakistan is completed in 16 years of formal education. In this case, you will get 22 points.
You must have experience equivalent to at least one year of full time job. And your experience must fall in two one of categories in NOC (
http://www23.hrdc-drhc.gc.ca/2001/e/groups/index.shtml)