Determine whether your site is in Google's index.

site[colon][url].

If you have just launched your site, then wait a little bit. Make sure that you have all your resources in order. Get Google Analytics installed on your site right away. Sign up for webmaster tools. Those resources are at analytics.google.com and webmaster.google.com. Tweeting links to your site will help get your site indexed more quickly. There are other possible problems with indexing, but this is a rare problem. If you installed wordpre