u have to make sure u have all your relevant documents such as bank statement,letter from your employer stating your employment is permanent, and your position in the company and salary if necessary,and also hotel reservation in canada to show where you will be staying and flight reservation,travel insurance,prove of financial means to cover your living expenses ,which could be travellers cheque or traveller bank card and any necesary that you think could help in upport of your application i suppose just a little brief of support,if only you are from Africa because i believe all the europeans travel to canada without a visa for the first time.