Write, write, write.  The content on your website is your organic marketing and how you will trigger the search bots to discover your website, what you offer, and your services or product.  You need to establish 3 things: 1. You as the expert in your industry 2. You as the Authority 3. Trustworthiness.  Each of these is something Google pays very close attention to and can be achieved by having excellent content on your website pages, you blogs, and in articles that others link to, or also share.