Custom Web Search Engine w/ PPC Capability

Looking to create a 'kid-safe' search engine, similar to Google / MSN / Yahoo. This search engine should automatically scrub out certain offensive/adult websites based on content/keywords. Key to the site is a 'sponsored ads' section (similar to Google), with a fully automated merchant account (users can create PPC accounts and fund their accounts). Site should also have a 'report a site' feature, users can request that a site be removed by the administrators, should our bots fail to eliminate an inappropriate site, we can do it manually.