The item still has to leave you some money once eBay takes its cut and you pay to ship it. A product can look profitable right up until one return wipes out what you made on the last three orders, so small items that are easy to pack are usually less painful at the beginning. You can read about what to sell on eBay here: https://easync.io/articles/what-to-sell-on-ebay/ . Pull out a few ideas that you can actually source and put up five or ten listings from each group. The watchers, offers, and first sales will show you which direction has some life in it before you sink money into a full inventory.