Expect that 20 % of your selling price will go to eBay and Paypal for their services.
You pay on both the selling and the shipping price.
There is an indication of the amount you will pay just before you click to List your item.
Do NOT start auctions at 99 cents. EBay tells you to do this. It will end in tears. Start at the lowest price you can accept comfortably. And set up your shipping using metric measurements.