Well affiliate ad publishing can be like Google AdSense, but most of the time they provide graphic ads that you post and add the tracked url to. And then when the ad is clicked on, it is tracked. Also, some ad publisher platforms offer APIs for distribution of ads, so that you do not have to do all of the posting work. You can for instance try Amazon Associates affiliate program and obtain ads and links that way. You can create a permanent ad that does not have to be updated. As well as time sensitive ads that run for a certain date. Just search for Affiliate Programs or Affiliate Ad Publisher Programs and research them. Some companies will scrutinize your site for approval while some do not.