Hi wwdt2001, congrats on your AIP&OWP&DM!
Montreal office will send you a confirmation letter before your landing interview. Maybe, the letter will be sent to you within a couple of months. This step happens to only people living in Quebec. Don't worry. Just confirm some questions and send it back to Montreal with 2 photos for PR card. So, if you have time, please go to take your photo for PR card.
About the size of photo: http://www.cic.gc.ca/english/information/applications/guides/pdf/5445EB-e.pdf
Now you can register the RAMQ.
http://www.ramq.gouv.qc.ca/en/immigrants-foreign-workers-students/health-insurance/Pages/eligibility.aspx
Congrats again!