Performance Indicators

Hello,

I'm developing a project appraisal for a service that has a portal.
The number of users for the portal is already forecasted and I'm looking to forecast some indicators such as page views, earnings per page view, ect

Which are the most common indicators you know and where can I find information about them?

thanks,

i

 

Try entering your competitors sites into here, and you will get an idea: http://www.quantcast.com/