Start with a blog. Write original content, and post at least two to three times a week. Follow other bloggers in your industry, and repost your blogs across all your social media networks.
Utilize twitter tools to discover prominent and influential Twitter accounts in your industry. Use hashtags so that your tweets appear on trending topics in your industry. Re-tweet often and grow your Twitter following by ten people a day.
Social media is very visual. Showcase your products through Pinterest, Instagram, Facebook, Tumblr, and Flickr. Infographics are an easy way to share your message on social media.
Videos are fantastic way to increase SEO organically; and are an excellent branding tool. Videos look great on mobile devices, and get your brand in front of a wide audience.