Congratulations, you have set up your first item! You want to make sure that people aren't guessing what you expect from them. Details, details, details. So you want to put on your listing:

• Method of payment that you accept (Paypal, Credit Cards)
• How soon they should make their payment. (i.e.: plz make payment within 7 days)
• Let the customer know how your shipping the item. (USPS, UPS, FEDEX)
• Let the customer know when you plan on shipping the item. (i.e.: item will be shipped within 4 business days)
• ALWAYS get confirmation/ tracking number when shipping.
• If you plan to list a lot of items you may want to consider getting a small scale, this will save you time and you won't have to go to the post office as much. Check eBay for shipping scales.