The P1 and P2 in PR application process come at the last stage of the process, once all process are complete, you will receive email requesting to confirm your basic detail info mainly address and then next will be to request you uploading the photos that will be on your PR. After that you will receive a eCorp - which is an electronic PR doc before you get a PR card.
if you are at the early stage of applying for PR, I would recommend looking for a forum thread hear that match the year you applied or you the apply for PR. U will find details about the Process and experience from others