This is a summary of what I know to be true, and can pass on to you. Others may have learned more, or experienced differently with other types of items. Ebay sells everything, and this guide is meant to help only on what I know to be true.
Selling other than clothing, gifts, may present a different experience. Guides are just assistance, a concept, and not the entire picture. They can however, save you from making any of my past mistakes and help you earn money faster by taking my tips and preventing the losses that I incurred.
To start a business on Ebay, it's great to know some things first. I knew nothing, and lost money for the first 2 years. I was lost on here, and there were not guides. I did not even know how to find the right category to list my items in, it was all a hard learning experience. Putting an item in the wrong category prevented buyers from even finding what I was listing. It's much easier now because I know what I am doing, and know how to list it under the right heading.
It's a little easier to start as a buyer, because then you have learned how it works. And it's really hard to start to sell, if you don't have a "Feedback Score" because no one knows who you are, or if they can trust you.