There is no application to fill out on your part, at least I did not fill out any application. I went to the local Service Canada office the day after I landed, they took my information and input it into their system, I signed off on it, and they printed out my SIN. The only things given to me at landing were two official copies of my COPR. One was for getting my SIN (which Service Canada rejected anyway, they wanted to see the carbon copy that was stapled to my passport) and the other was for my medical insurance (which was accepted by the QC medical insurance). Other than that all I got was a handshake and a "welcome to Canada."