PR after getting married in Canada

Hello Everyone!

I'm a Brazilian and I'll get married in Canada next September to a Canadian citizen, living in Canada. We are together it's been 13 months and he already came to Brazil 3 times and I went to Canada once, for 2 months straight.

I'll be leaving Brazil in August with my tourist visa. Obviously I have some questions as I'm concerned about the Permanent Resident Visa:

1- If I leave Brazil in August and get married 1 month later, will it be considered as a fraud? Should I wait 61 days after I arrive to do it so, considering I have to go back to Brazil for a while after that?
2- As we get married inside Canada, can we still apply for the PR from outside Canada, even if I stay in Canada for a while, as I have a valid tourist visa?
3- As the application is being processed, can I come to Canada later on if I already have a tourist visa? Do I run the risk of losing my application?
4- My passport expires on 2013. As soon as I get the PR visa, the passport will be near to expire. What should I do then?

Thank you very much in advance. Please I'm looking forward a reply.

Tchau!