This is especially important for small businesses, you want to develop a marketing strategy that allows you to build a relationship with your potential clients. Staying in regular contact, offering special pricing and learning more about them is the bases for this relationship.
There are many ways you can accomplish this, but I think this is the easiest way.
You will want to create a autoresponder or newsletter account and create at least one message. The provider you choose will have very specific instructions on how to create the code required to add the form to you website. We use Aweber.com (affiliate link) for all our email list management. Very easy to use and great tutorials.
From the Dashboard
Step 1 – Under Appearances, Click Widgets
Step 2 – Add a text widget to the sidebar * we suggestion that you make this the first widget on your sidebar, whether your sidebar is left or right.
Step 3 – Open the box and copy the sign-up code * you can use the html or the java script
Step 4 – Click Save and close the box