CPC / PPC Ad network script

Hi, I am looking to have a script for online ad network where advertisers can buy traffic and publishers can publish ads on their sites to get paid.. This would be similar to adsense though it is very big company however the basics would be same The key features would include - GEO targeting bidding for advertisers Keywords targeting distribution of ads Advanced report for admin, publisher and advertisers Please PM me if you have worked similar kind of projects..