Hi,
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It's a very good question with an unlimited list of answers. This question would only be justifiably answered by a book on it. yet, I'll try to condense it here.

1. Make sure you add a blog to your website. Try to use an "Out-of-the-box" SEO ready CMS such as Wordpress or Joomla for your blog. They are easy to manage and get you lot of traffic by themselves (they are extremely SEO friendly)
2. Write exceptionally great content. If you can't write or if you don't have the time, have someone else write for you.
3. Connect on Social media. Make sure you let your visitors connect from each social media network to your blog and then from your blog to each of your social media networks.
4. Leave comments on high-traffic blogs. Not one-liners. Really intuitive, insightful, knowledgable comments.
5. Link to other bloggers generously through your blog.
6. Focus on SEO for your website -- this is a long term process.
7. Try Pay Per Click Ads.
8. Do email marketing.