+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
First find an employer in Canada who is willing to give you a job offer.

That employer must then apply for a LMO (labour market opinion) to request approval to hire you.

If the LMO is approved, you can then apply for a work permit.

If your work permit is approved, you can then come to Canada to work.

So the first step is finding an employer.
 
Or depending on your age and which country you come from you can apply for a working holiday visa.

here's some more info

http://www.international.gc.ca/experience/index.aspx?view=d