I used to sell all kinds of things on ebay at different periods in my life.
Just so you know, it costs to list something.
A few years back ebay changed some of it's policies to where sellers could not leave feedback, but buyers can, meaning buyers have more power.
Some things sell, some don't.
Before you bother listing anything, look that item up on ebay to see if there are already 30 of them listed.
Now, the good part- you can add a "handling fee" that is included in the shipping estimate. I used to add a dollar or two.
Some buyers are great, some are spoiled housewife types that love to complain.