Rich keyword informative contents a week will do the job, beside that use Wonder wheel from google and dig to stage two and use those keyword on your contents.
organic seo : onpage and offpage optimization such as: article submission forum submissions blogposting blogcommenting link exchange directory submissions forum submissions social bookmarking rss submissions web design and various other process as well. whereas as in-organic seo is nothing but opitmizing paid ads by search engines like google, yahoo, bing etc... i prefer organic seo mate...
Fist thing comes first. Focus on things that matters and not things that are not worth wasting time like directory submission.
unique and fresh content and build quality backlinks as many as you can !!! this is the best method !!!