Good luck. Trying to game Google rarely ends well. You are much better off building a network of relevant, quality sources by building your own blogs and employing a scientific keyword research and SEO competition tool like
Market Samurai.
Build quality relevant content for surfers, provide them value and you will make more sales and build a much more stable, reliable and dependable backlink network that Google will reward you for.
The method to use is to target highly relevant keywords you have a hope of ranking with, post about them on your own blogs on seperate IP addresses in different neighborhoods if possible, deep link into your content, encourage users to share your content, make your content something surfers will bookmark and keep coming back to.
As your blogs dominate certain keywords your sites gain more authority, you can then target higher competition keywords.
People who spend alot of time thinking about how to game Google rarely do as well as people who scientificially and methodically build quality, reliable and renewable targeted traffic streams and provide high quality relevant content to the surfers in those streams.