I used to sell quite a bit on ebay, but they have steadily raised their fees so I rarely use it anymore. Why don't you try craigslist. You're somewhat limited to locals but there are no fees.
There are other auction sites out there as well:
http://auctions.nettop20.com/
As far as advice goes, if you are determined to use ebay, here are a few tips to get you started:
1. Be very clear about what is offered on your listing page, including any flaws or defects in your products. If you are selling as is, make sure you state it and decide if you will accept returns. If not make sure you state that on you listing as well.
2. Use photos, photograph the actual object for sale (not a stock photo) make sure you use a neutral background, ie. don't photograph the item on your bathroom counter surrounded by all of your RX bottles and bathroom stuff.
3. Choose the day you end the auction. Studies have shown that low volume, high profit items sell the better if the auction ends on saturday. Keep in mind that ebay is a very fluctuating market. What works one week may not work the next.
4. Make your listing easy to read, simple and attractive.
5. State your shipping and handling procedures and charges clearly. Make sure you charge enough to cover your shipping costs.
6. Decide how you want to be paid. Check. Money Order. Paypal. If you accept checks, hold the sold item until after the check has cleared and state that you will be doing so in your listing
7. Mail your item quickly (within 2 days of receipt of the money) if you cannot, make sure you advise your buyer when the item will be mailed. Communicate. Communicate. Communicate.
8. Don't forget to give feedback!