First thing you do is invite customers to sign up for a news letter - creat an email list that you can market future products to. If they join your mailing list that means they are intreested in your products

Your Meta Tags
<meta name="description" content="Default Description">
<meta name="keywords" content="Magento, Varien, E-commerce">
<meta name="robots" content="NOINDEX,NOFOLLOW">

Change the description & add keywoords and seriously why are you telling Search engines not to list you?

Good SEO is not expensive - just common sense!