I’m starting a new site and am selling banner space but don’t know how or what I should charge. Must I charge per month, clicks, impressions or combined. What is the norm in this kind of thing?
Its better using adsense, if your website is about something like arcteture, educational, you could sell CLICKS because most of people don't like impressions.
The price you charge should reflect how targeted your visitors are. The more tight the demographic the higher the price. Also, factors such as the number of visitors may play a role. If you have a high traffic site you can fill the orders much faster.