You need a compliance letter or stickers on the vehicle that show it's US compliant, and preferably make sure there is no lien on the vehicle. Many loan companies, even those through the maker do not allow for a vehicle to be exported, and many states have issues with foreign liens when you go to register.
For Canada the I-134 is listed for Montreal as a required document to have in the Packet 3 checklist. http://montreal.usconsulate.gov/visas/visas/fianc-k-1-visas/forms.html it's also required for Vancouver: http://vancouver.usconsulate.gov/visas/fiance-visas.html
If they look at it or not is another story, but imo don't leave it out just on the whim they may not look at it.
Generally speaking, you'll have to prove that someone can make at least 100% the poverty line to cover you. If your fiance makes 100% of the poverty line and it will only be you and him then you're good. If he doesn't make that much money per year, you're going to need a cosigner. The lines can be found here: http://www.uscis.gov/sites/default/files/files/form/i-864p.pdf
They also don't care if you can support yourself, your money is not taken into consideration (generally) the purpose of this is that the person sponsoring you will ensure you won't become a charge of the state. The same thing will happen with the green card, only your sponsor will have to make 125% of the poverty line for the number of household members.
I'm not understanding what you mean by registering to fill out the form, it should be found here and it should just be a pdf file that you can either fill out online or print out and fill out in pen. http://www.uscis.gov/sites/default/files/files/form/i-134.pdfJust because there's space to type in info doesn't mean you have too, depending on your browser simply save the file or press print to print it.
As for filling it out, you can just print out the blank page from the site and fill it out with pen or fill it out in Adobe Acrobat and sign.
Are you using this link http://www.uscis.gov/i-134
that would lead you to here? http://www.uscis.gov/sites/default/files/files/form/i-134.pdf
You must download the PDF and fill it out either on your computer and print it or fill it out by hand. Make sure to go over the instructions carefully.
