You start looking here: http://www.cic.gc.ca/english/immigrate/index.asp for an immigration class you could qualify under.
If you have 2 friends in Manitoba, they can sponsor you under the Provincial nominee program there but as far as I know, that is the only instance where a friend can sponsor for immigration.
Of course it would be possible if your friend can get you a job offer that you can immigrate on the basis of that.