Hi
You will need to contact the Canadian International Tax Office in Ottawa, to determine residency status for filing based on your personal situation. http://www.cra-arc.gc.ca/cntct/prv/tstc/twts-eng.html#ntrntnl
Once residency is determined, if non-resident for tax purposes, you would need to file a paper return to that office, including all worldwide income earned while a resident and all Canadian based income after leaving Canada.