I am currently building a financial website that is related to the stock market. I would like to incorporate an ad service to generate revenue. I am leaning towards valueclick as of right now. I'm wondering when the best time to signup for this type of service is. I understand that I have to be accepted. The sooner the better so I can have the programmer insert the code. Do these type of services require that you are up and running for awhile before you can start displaying ads?