You can definitely adjust where you ship items.

Canadian shipping is really pricey, but look into the flat rate boxes that they just recently introduced.
Or you can bring your items to be weighed at the post office before you put up your listings. This way you can be accurate about the shipping. Although you will notice that people overcharge for shipping on ebay....

A good way to price things is to do a search of a similar item and see how much those items are selling for.

Make sure you take good pictures (more than 1 is best) and have as much details as possible when describing your items!