Sponsoring wife from Vietnam

I am a Canadian citizen. I have gotten a marriage certificate from the Vietnamese government. I am planning to return to Canada from May until August to work, and then I am coming back to Vietnam with my family and friends for the ceremony.

Do I need to have the ceremony to begin sponsoring my wife, or can I begin sponsoring her when I return to Canada next month?

I have read that it is faster to sponsor her from outside Canada. Obtaining a letter for employment is not a problem for me, to prove that I will return to Canada. Is it possible to begin sponsoring her even before I leave Vietnam?