They send to the address indicated,usually sponsor. (Hope your address is in Canada)
Yuo will hear different opinions. My view is review and update as much as possible to be sure (including if new forms)and resign. They might accept if something slightly out of date but why risk it? Things like most document copies and translations and photos should be fine.
I don't know about the police check. If easy and quick to get, I would get new. But I think cda will go to USA for police check anyway directly by infosharing.