At immigration, just hand over your passports and COPR. You will be asked to sign the COPR in front of the immigration officer (do not sign it before that).
For the PR card you just need to give your address in Canada for PR card delivery and he may ask to see your POF, other than that there is no further process with immigration officer (rest you have to do at other counters e.g. Services Canada and Customs).
You will be filling out the number of days you are planning to stay in Canada on the landing card you will get on the plane: http://www.cbsa-asfc.gc.ca/publications/forms-formulaires/e311-eng.pdf
There are 2 potential problems (very rarely faced, but I know at least 1 example of each) can happen if you are declaring your intent to stay in Canada for less then 1 year:
1. Immigration officer can refuse to process your PR card now and will give you an address update form to fill out once you come to Canada permanently (you can also do this online after you land). The only implication is not getting the PR card, however you will become a PR and your residency clock will start ticking as soon as you sign the COPR and immigration officer stamps your passport.
2. As per Customs regulations you are not consider a permanent resident (only for custom purposes) if you do not intend to reside in Canada for at least 12 months in that trip:
http://www.cbsa-asfc.gc.ca/publications/pub/bsf5113-eng.html ... The implication here is that customs will not stamp your form B4 (goods to follow) on your first landing. As this opportunity allows new immigrants the opportunity to bring in any goods tax free at a later time that they declare on first landing, you may have to pay tax on some of the items you bring when you intend to permanently settle.
Best of luck
Regards,