When I first started listing on eBay a year ago...I didn't know a thing about it. But I didn't look at any guides, I just started listing things. Some things I found out:
1. Be clear & detailed in your description. Buyers don't like descriptions that just say for instance "52x32x52 CD-RW drive".
2. Get a good camera and take good pictures. Buyers appreciate good clear pictures. Take pictures at different angles. I've had people email me with compliments on my pictures.
3. Start your listings at .99. (Most of the time). I've found out that items get better exposure & thus sell better at a lower starting price. Plus it lowers your eBay fees.