Add small banners gallery to my wordpress website homepage

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 gallery on my car classifieds website's home page, where users can simply click and buy an ad space for any category to list their cars for sale. Very similar to this script: [login to view URL] My website is fully funcitonal and live. It is working with a third party wordpress car classifieds theme that I bought, here is the demo of the theme: [login to view URL] Website already has web form to input car details such as price, location etc. and item description destination page, payment integration, etc. You just need to implement the ad banners gallery feature to function with the theme. Thanks.