Selling your stuff is largely going to depend on what the stuff is. If it’s small items that can fit into boxes, then list the stuff, get some flat rate boxes from the post office (free), and some packaging materials and start listing and selling. Flat rate boxes are easy to use, the shipping price is always the same for each size box, and there is a post office in every town, making it easy to ship your stuff. Myself, I have a PayPal account, I get paid through PayPal, and use my PayPal debit card to pay for shipping. . Easier to keep track of that way.