Social and email marketing, will grow your contacts. Having a website, a facebook page, and using an email service like MailChimp is enough to keep your existing clients and add new ones. If you want to expand your marketing efforts there are paid solutions such as pay-per-click and traditional print.
Email | Social Media | Marketing
Email and social media together can create a circle of activity keeping your current audience interested in your brand while also pulling in new client/customers into the loop. Sending out an email newsletter or new blog post that includes a link to you facebook page can help grow your community and validate your business. Email will push people to your facebook page for a discussion and facebook will then pull people to your website. Comments and likes will move the discussion beyond your existing customer or client base allowing new entries into your circle.