eBay is pretty easy to use nowadays. If you have a digital camera take some pictures and make notes of as much information as possible. Get some packing material and box everything up, get their weights and determine shipping costs before listing the item. Follow the registration process on eBay. eBay will charge you a listing fee, value depending on features and a final value fee depending on the ending price.
If you go this route just use the standard selling tool on eBay for 1 auction. Don't bother with all the other tools. If you have any questions just let me know. It's not all that difficult really.