Hi, and welcome to the forums here!

First question, I guess, is where are you coming from? Then, you may want to first consult the website of the Canadian Consulate in your country. They'll have the information for visas and all that specific for your country of origin. (Often the Embassy and the Consulate share a website. I only recommend the Consulate because they generally deal with "people" issues, whereas the Embassy is more for businesses and other governments.)