Passport request letter, as the name suggests is for you to send your passports to the visa office for visa stamping. They Will put a visa on the passport and along with it, provide a COPR document. Once you get these, you can fly to Canada. At the point of entry (airport) you will be directed to an immigration officer. This officer will complete the formalities and stamp your COPR document. This is when you become a permanent resident of Canada and the process is called landing. You can apply for medical cards and other things once you’re in Canada.