Select a location for your site
Sign in to Google Sites with your Google Account, and click the Create button. When choosing a URL for your site, keep the following in mind:
Your site name (and URL) can't conflict with an existing site name.
Your site URL can't conflict with an existing Gmail username (unless it's your own).
Site URLs can only use these characters: A-Z, a-z, 0-9.
Google Apps site names must be unique within their domain only.