Do some buying.
Honestly this is a good way to learn how eBay works-- and from the point of view of your customers.
Guessing from your name you will be selling golf related items? Those can be bulky and heavy. Go to canadapost.ca and check on shipping costs in the BUSINESS section.
Plan to ship with Paypal shipping labels which offer a 5% to 18% discount on PO counter prices.
When you go to the Sell Your Item form, note that you can ship with Calculated Shipping. You need a scale and a measuring tape.
USE METRIC MEASUREMENTS. Canada Post went metric in 1974. All other measurements are estimates and will do you wrong.
Who ordered a dead guy?-- Jayne Cobb