Most people travelling to Canada need either a Visa or an Electronic Travel Authorization (Citizens and green-card holders from USA are exempt). Please go to http://www.cic.gc.ca/english/visit/visas.asp to find out which travel document you need.
If you need a Visa, please fill out the following form asap: http://cvr-forms.apps01.yorku.ca/machform/view.php?id=10963 We need this information in order to provide you with a letter to Immigration Canada. Visas can take a while to process, so the sooner we can provide you with this document the more likely you are to get your travel documents on time.
You should also purchase travel health insurance for the duration of your trip unless already covered for medical expenses in Canada under an existing insurance plan.