I have created an account on cic and completed a questionnaire there, they have provided me a checklist of the required documents, in my case those were: acceptance letter, passport, digital photograph, financial support docs, upfront medical(if you have one).
Though in the optional “client information”, i have submitted an SOP with all my school Marksheets, university degree and transcripts, IELTS, experience letters from my employers. I have asked the international Student advising department of the University of Alberta and they advised me to provide all these documents.