I am going to start building my buyer's list. I plan to use aweber for the auto responder mechanism. However, I know that the list can get very big and there will be buyers at different stages of involvement with your company. For example, a new buyer should get a new "Welcome" message. A qualified buyer that has been on the email list should get a different marketing message.
Are there any blueprints or reports that I can read to learn how to market to this list effectively?