How long should I wait before making changes to my new site in order to increase ranking?

[Greenpeak]

I just create a site www.autoinsurancefremontca.com.  It has been about a week since this site has been launched.  The site currently resides at 12th position on google.  With Semoz it has a Site Grade Of "A" .  When should I start making changes to the site like adding a content as an example to increase my ranking. I am trying to get this site on the first page with google.  Please help!!

[GeorgeAndrews]

It's never too early to add great content to a site.

[Greenpeak]

thank you for your insight i really appreciate.