answer to my previous question

I think I have a better understanding of my previous question. However, if anyone can help clarify for me, that would be great. If I read and understood correctly, the process will go something like this:
my boyfriend and I will get married
we will send in the applications for him to sponsor me (along with other necessary paperwork)
we may get approved and I will wait to be granted PR
I will not have to be in Canada while waiting if I apply outside of Canada
I will keep my teaching job in the US and then I have until the expiry date on my PR card to enter Canada
I can then begin working in Canada as soon as I can find a job