At the first stage you need to submit all of the documents listed on the following document checklist :
http://www.cic.gc.ca/english/pdf/kits/forms/IMM5612E.PDF
At the second stage you have to submit all of the documents listed on the visa office specific forms according to the visa office that you belong to :
choose your visa office from the following link and check the required documents : (at the bottom of the page)
http://www.cic.gc.ca/english/information/applications/skilled-mission.asp