post proper and unique contents in your website
make proper use of keywords in content and meta tag
make links with keywords

Follow google algorithm and many seo tricks like Press release, article submission, blog creating

Yeah SEO is the best technique to get free traffic online...but unlike PPC which takes only 5 min. to display your website on searh page...SEO needs a long time hard work with full dedication....ur site may takes 6 months to rank well in the search results...