if you're applying outland ( which I assume you are), you can not get a work permit in advance. No need to send anything with the application. Once you are given the PR - you become a permanent resident, which means that you automatically have the right to work. Once you land in Canada as a PR, you can go the next day to any Service Canada, get your SIN ( social insurance number) and start working the next day ( the SIN is issued right away and is valid the same day, there is no added procedure for you to get a work permit etc).
If you're from a visa-exempt country, you can come to Canada on a tourist visa and wait out for your PR here, but you won't be able to work before you have your PR.
Hope it clarifies a little!
Sweden