1. Headlines: Your headlines should be attention grabbing when using free classified ads. These types of ads are scanned very quickly and you have only seconds to reach your target audience.
2. Ad Body: Use very descriptive ads, listing the benefits of visiting your site. Whether it's a free offer or just great information, tell the readers exactly why they should visit you site Now!
3. Links: Use direct links to the page that offers the specific information used in your ad, or to the freebie advertised.
4. Relist/Update: Many free classified sites will only allow you to display your ad for a limited time, and those don't limit your ad time will simply push your ad to the back each time another ad is placed. To get the best results, you should update/relist your ads weekly, every two weeks at most. This will allow for good positioning on the site.