My best suggestion is you watch the auctions that are similar to the stuff you want to sell. Find out what other people are listing their stuff for and what it is actually selling for. There can be a huge discrepancy between what you think it's worth and what it will actually sell for... either too much OR too little.

Pictures are worth a thousand words. Make sure you get enough and good quality pictures of what you are selling. I don't think I've bought many things that I couldn't really see before buying and I've never bought anything that didn't have pictures at all.
I've bought well over a thousand items on eBay and one of my biggest pet peeves is people that charge an arm and a leg for S&H. If you are over on S&H I won't even look at the auction. People will want say $10 for an item and so they put their starting price at $2.00 and charge $10 for shipping. And you know darn well it only cost about $1.67 to ship the item. Makes me crazy.

Not only that, it is morally wrong.
Okay, well that's my

Good luck selling a ton! What's your seller name? I'll come and check you out.

~m