To allow your fans and customers to subscribe direct to your mailing list you can make a page with a mail client embed, as well as your own call-to-action.
Add a "Code" module
Grab the HTML embed code from your mailclient and cut and paste it in to the box:
Add a Text Module to include any additional information about your mailing list, and marketing. This module can include HTML formatting or you can use markup to provide basic styles.