It isn't immediately clear to me whether you're helping people create banner ads, or helping people create banner ads and put them on an ad network (i.e. run an ad campaign). That's just from spending 20 seconds glancing at the front page.
(1) Create a banner using our templates (and show examples here so I have some idea what you are talking about)
(2) Set your daily budget, ad networks, and demographics. We'll handle the details
(3) Track your progress using our custom campaign monitor
This information would ideally replace your "Free" banner and copy that is the focal point of your design.