Ad Share Plugin

I need to develop an ad plugin that allows the admin to split ad spaces with other users and contributors. The plugin should have the abilty to: - Split ad spaces with authors/contributors based upon a percentage ratio - Have up to 8 ad spaces - Choose which authors can display ads - Set the author vs. admin ad split ratio (%) on the author's posts - Set optional ad split ratio (%) on main page (admin vs. authors) - Option to manually approve author ads before they display - Set instructions for each ad space, for author to see (size, additional instructions, etc.) - Have a shortcode, widget, and manual insertion code for each ad space The plugin needs to be easy to use. Developer will be required to sign a non-disclosure agreement before beginning the project, and the full rights to the plugin will be transferred to me upon completion of the project.