Unfortunately, you don't get any special rights/treatment for being married to an American and you get very few for being an American. The only provision for Americans is the NAFTA treaty which covers a fairly narrow band of professions -- more information here: http://www.cic.gc.ca/english/work/special-business.asp#nafta
However, in order to qualify, you yourself would have to be an American citizen. Otherwise, you're in the same boat: you can find a job first and apply with a confirmed job offer or you can apply separately and look for a job once you have your permanent residency, but the process is essentially the same (though quicker if you have a job offer.)
Here's where you would begin the normal process: http://www.cic.gc.ca/english/immigrate/skilled/index.asp
