It's not a good idea to open a store until you have been selling for a while. New sellers have selling limits so you won't be able to take advantage of any extra listings in the store. Sellers without a store can list up to 250 listings once eBay no longer considers them as 'new' but for now you can only list a few items at a time.
You will need to set up your eBay selling account with a Canadian bank chequing account so that you can sell and get paid. Have you done that?