You can do great FAQ document but your leads will still have questions about your product or service, so be ready to answer their inquiries. Make a simple "Contact Us" form with just a few fields (don't ask too much at once), where people can leave their contact information and their question. In order to keep your communication on top level give a shot to email marketing systems like Aweber or 1ShoppingCart . They can help you to send automatical personalized reminders and newsletters to your customers and keep them up to date about your special offers and events.