Well you made it sound soooo easy,but as a newbie i don´t have a clue.
The idea is to put the button ¨Renew your ad¨ into the ad.
If you click the button you should come to the pay section,
After payment your ad goes back to the top of the list again automaticly.
I really think this is the best option to charge for the ads.
Anybody have a little free time to help me out???