I need help selling on ebay?

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The priority mail box o-box7 would go by weight. The price depends on the weight and destination. If you have a postal scale or a small kitchen scale, weigh the item and the box together. When you go list the item on ebay, under shipping method choose priority mail and enter the weight of the package. Then ebay will automatically calculate the shipping price according to the distance of your buyer.
Once that is all setup on your ebay listing, when you sell the item, you can print the label directly from ebay and tape that label on the box and you can either schedule a free pickup at your home on usps.com or drop it off at the post office.