Anyone Have Experience Selling Things on eBay?

Hi all, I am wanting to try sell things on Ebay such as sneakers due to the TradeMe market not having much traction for value (unless they're hyped models etc) therefore, if anyone has any experience with selling on Ebay - how it works, how much you pay, how much return you get,account management, costs and shipping etc. would like to hear from you. Thanks!