Hi there, Ebay has two ways to create Ads, one in ebay dot com or ebay classifieds, that depends of what kind of Ad you are planning to do. The fields needed on the excel spreadsheet. Most Classified Ads run for 30 days. Just so you know Ads are posted on eBay but the transaction takes place off eBay, you handle the transaction personally on you site or designated ecommerce site. Let me know if you want me to help you with this project. Thank you, -Eddie