There are several new blogs that will be of help to your agencies new business efforts that I want to introduce. Each of these blog authors have a great amount of experience working with advertising agencies of all sizes for new business and each of them also has a unique perspective. I highly recommend that you include them in your online reading as resources for your agencies new business.
Ad Agencies Should Use a Database Service for New Business
A number of ad agencies that I talk with attempt to maintain their own database of prospects. For a short list that is doable but if your list is large it is impossible to maintain unless you have someone totally dedicated to keeping it updated on a regular basis. I recommend using a database service company.