indeed - lots of thing to do. I suppose that it depends on the time you have, and the energy etc! for me, I started working piece by piece. Forms by form. One thing to do it to print out all forms and guidelines, and start putting notes, information, etc. Start gathering proofs, evidences, etc. And clear out a space in your house for it! for us it meant that for 3 months we didn't have dinner at the table, since it was "occupied" by papers. Make piles, rearrange... and start again! take a break from it for a few days when it becomes too much, and remember that it is normal to get overwhelmed. at some point you reach a stage where it starts to make sense, where you can see the end of the tunnel, and it starts feeling a little bit better - less overwhelming... and soon you will find out the best way to present your application. Follow the check lists as much as possible, but try not to compare with other applications that you read about - every application is different. Some people send over 10kg of proofs ( literally!!), some less.. try and leave your application aside for a while when you worked on it for a bit, and see if it would convince a stranger that 1. you intend to live in Canada ( which might be the easiest since you are already in Canada, so that should be pretty straightforward to prove! just gather proofs of where you are, what you are doing, etc), and 2. that you are a real couple. Pictures, letters from friends, trips together, shared bank account ( see if you can ad dhis name to your bank account), anything!
then - if you have questions, don't hesitate to ask. Reading the forum is a good place, and there are plenty of US/Can couples who can help...
Good luck!
Sweden