Hi anshpatel84,
1) Yes. US bank statements are generally acceptable. My friend used Bank of America's statement with verification letter. However, you would need CA$ for paying taxis, hotels and restaurants, etc
2) Yes. Electronic items can be mentioned with Serial #'s & their estimated CAD Value. Phones can be mentioned with their IMEI #'s. In terms of furniture and clothes, you can batch them up, write quantity and write their collective value. E.g. if you have 20 shirts, write "Shirts" and write their quantity and values (collective value).
3) To be honest, bringing Cash is always the safest bet. Many people bring it on daily basis. Many people cross borders with their bank statements (stamped and signed, along with verification letter on bank's official letterpad). However, I would never risk my immigration and carrying cash is not a big deal. If you believe cash would be a hassle, you can request your bank to give you $100 bills and you can carry them easily in your jacket.
4) No. You don't have to carry those documents. However, it's always advisable to carry your birth certificates and marriage certificates with you.
5) Upon landing, you must give a Canadian Address to CBSA officer to initiate application of PR card. You can re-enter Canada on your personal/private vehicle (or by foot) by showing CoPR and passport. Without PR card, you will not be allowed to board train or plane (commercial carriers) ... unless you own a plane
Au Revior!