Ebay Seller tips. Whenever you are selling, expect people to contact you and ask you questions. Maintain a good line of support and apply these tricks and one day you could become a PowerSeller which lets you sell even more items with ease. These are just a few things you should to do to learn how to sell successfully on ebay. As you do more, you will figure things out and see what works best for you. The key is to get started. Doing nothing will ensure that you never make it.