An important wat to get your website ranked high on Google using your specific keywords is to get “one way links” from high Google PR sites that are relevant to yours.  Google interprets the one way link as a positive “vote” for your site for that keyword. 

It is important to create a variety of links with as many websites as possible. A lot of the websites with high PRs will not publish your articles or links. 

However, there hundreds of article submission websites but probably fewer than 50 of those have high Google PRs but they are the ones you want to target. 

Recommended sites are Ezinearticles, Goarticles and Sitepronews. 

Commenting on blogs can help too; jusy find a relevant blog with a decent Google PR and make a comment! You should get a link back to your site on the comment. However, make sure the comment is relevant, meaningful, well written and not deemed junk or spam. 

This can be a slow progress, but should be continued and progress will be seen!