There are many ways to promote your website.  Here are a few of the basic steps you can take.

• Submit your site to the major search engines, Google, Bing (formerly MS Live Search), and Yahoo.  
• Optimize your website pages for search engine visibility.
• If your site is not a blog, consider adding a blog to keep fresh material on your site and attract return visitors.
• Consider adding a forum where visitors can discuss material presented on your website.
• Use links in your email signatures, online forum and blog comment postings.
• Use free or low cost press release sites to submit news about your company site.
• Use social media sites to forward your message and become an "expert" in your field.
• Join user groups and organizations relevant to your website's message.
• Consider Pay-Per-Click ad campaigns such as Google AdWords to advertise your site.
• Recruit and solicit back-links to your website from other good relevant websites.