Here are more ebay suggestions-
1) Provide a good, clear description of your item, including age, condition, amount of use, etc.
2) Provide good photos of the item.
3) List your terms for payment. If you don't want to take a personal check then state that in your listing.
4) List your terms for shipping and give a rate if possible. Of if the rate will vary a lot depending on how far it is being shipped then state that the buyer will pay for actual shipping charges.
5) Consider requiring insurance on the shipment, or at least some form of tracking so you can find out where the item went.
6) Pack the item well enough that you know it will get there in good shape.