Add Small Ad Banners Gallery to Wordpress Theme's Home page

This is a fairly simple project. You will not develop a new website, I would like you to add a widget/plugin/feature to have ad banners on my car classifieds website's home page, where users can simply click and buy an ad space for any category. Similar to this script: [login to view URL] My website is fully funcitonal and live, it is a wordpress car classifieds theme, here is the demo of the theme: [login to view URL] Website already has input form, Item description destination page, payment integration, etc. You just need to implement the ad banners feature to function with it. Thanks.