I use to be a very active seller on ebay before I married and started a family and have now recently gotten back into it.
Payment policy
I prefer paypal - it just makes things move faster and is easier. But sometimes I do accept money orders.
Shipping information
I try to ship items out as quickly as possible and shoot for getting them out within 2 business days or payment clearing. If shipping looks like it will be delayed for any reason (such as an ice storm like we had recently, or emergency/illness) I will always communicate with the buyer.
Return policy
I try to be as detailed as possible in my listings with descriptions and photographs as to avoid the hassle of returns and an unhappy buyer. I am always happy to answer any questions and even provide more pictures if needed.
Contact information
I check my ebay very regularly and encourage anyone with questions about my listings to contact me and I will respond as soon as possible.