I've been in the eBay business for more than a year and here are some tips for anyone looking to start up their online vendor.
eBay doesn't charge you final value fee for shipping cost. Most sellers doesn't know this since they're either lazy to read the rules or think that "free shipping" is the way to go. It's not.
But don't go overboard/abuse it. For example, set your fixed price at 99 cents and charge shipping for $100. That's a surefire way to get your account suspended.
I don't feel like sharing one of my many important eBay tips with anyone but since I'm feeling generous so I'll share one to the members of this forum.
The important tip in order to boost your sales is to get your listings on the front page of the "Best Match" category. Key word, feedback score, etc. all play an important role in getting your items on the first page for the "Best Match" category.
Since most customers are lazy to filter the option from "Best Match" to "Low price & shipping", they tend to buy the goods shown on the first page of the "Best Match" category.
I took advantage of this and invested a couple hundred dollars into subtitles and titles in bold and my sales skyrocketed.
Don't forget about your business ethics as well. Shipping out items on time, leaving positive feedback, replying to questions from customers on time, etc. will boost your sales.
It'll help if you invest some of your time reading up on stuff about eBay and how to boost your sales, etc.