My husband and I did a workshop this weekend on online marketing. Off the top of my head, the tip I remember that was repeated over and over was how important it is to collect email addresses. You want to grow and nurture your clients, and sometimes you need to touch some people over and over before they feel comfortable enough to buy from you.
There is a FREE email service named MailChimp that I heard was a good service. I can't tell you from experience how well it works or not. I haven't tried to use it yet. My husband likes to use Constant Contact. You get to start on it for FREE, but then after a few months, maybe three, there is a monthly charge.
Just wanted to share. It maybe helpful for you.