Greg, dsk makes some good points, and I have a few to add. I sell antiques, as many on here know, and I did Ebay for most of last year with mixed results. I sold some items, but the items I was involved in, antiques and jewelry, were difficult to move because some of them were high priced, and many were scared away by that.
I can tell you, that I took an extensive Ebay training program offered to only a select few who have been on Ebay for a while called onramp program. Several times a week, I would get calls from this guy, who would go over Ebay selling strategies with me, and how to sell. What DSk said about the good feedback is imperative. I was advised to first register an account with Ebay, and buy a few cheap things, paying extremely timely, to get some good feedback, so people would know I was a good risk to deal with.
Once I started listing my items, good pictures of the item are essential. Digital camera or digital development are best for this. People on Ebay will browse quickly, and only stop to look at the best pictures. They arent likely to spend time squinting at a bad picture.
Selling inexpensive items at first is best. Many times, the bids for these kinds of things will be competetive.
Finally, I was told that to maximize my sales, I should clearly state my payment and return policy in my listing, saying something like : I accept Paypal, check, money, order, etc. Furthermore, I was also advised to offer a detailed shipping and return policy, saying something such as:" I will ship within 24 hours, or, upon my receipt and clearance of funds." Usually, the wise choice is to wait til the payment has cleared, or to accept only money order or cashier's check, so you cant get screwed. I was also told to offer a return policy to my customers for added assurance, saying something like:" I will accept returns within 7 days for full refund, buyer to pay all return handling costs" This way, my customer rest assured he is dealing with a reputable merchant who will be flexible with customer satisfaction. All Ebayers dont do this, but this is what I was advised.
I hope these pointers help. Please message me any time or post again if you want to talk further. Ebay is a major marketplace, and can be used as a good means to sell merchandise. Good Luck!
Mitch