Write short articles (300 – 500 words) about the products/ services you want to sell. Make sure to use the important keywords that you want to rank for; in the title and the content of your article.
Create blog accounts on all major blogs sites and post your article/posts to those blogs.
Submit your article to all major article directories, Hubs, Forums and Wikis.
Post links of your article to all major Micro-Blogging & Social Networking sites including Twitter & Facebook.
Create videos about your product and service, and submit them to all major social video sites include YouTube. You should use keywords in the video description and links back to your website.
Gather all the URLs from blogs, articles, Hubs, Wikis and Micro-Blogging sites that you have posted your article to, and Bookmark them to all major Book-marking sites.
Create an RSS feed for all the URLs you have posted from all the social sites that you have submitted your article to and submit them to major RSS Directories.
Ping all of them!
Once above is completed, repeat this for ALL your main keywords and see what happens to your rankings!