It takes two things. Links to high traffic sites, and links from high traffic sites. The more people click on your site from high traffic site, the higher rating you get. (With Google anyways)
You have to submit your site address to sites and see if they will post them somewhere. Also adding your link to forums and other places can help. The more relevant your link is the more people will click on it. If you want to add links to your page, just use the following html syntax:
<a href="Address_Of_Page_You_Want_T0_Go_To">Text you want displayed on the page</a>