How to add advertising to all free blogs in my site?

I have a multi site where I offer free blogs. I want to show ads in all free blogs of the site so I can earn some money for maintenance from them. For pro sites ads will be disabled, that's one of the benefits of the ads.

How can I set up it all so that all sites show ads in their right sidebar? Or how can I add a top banner for all sites, for example?

I have installed the 133 theme pack, show sees ads, ad shareing, pro sites, I think I have all ad plugins in wpmudev.