Is your domain completely propagated? You should have updated your DNS information with your registrar. It may take up to 72 hours for this to complete.
Did you upload your site to your root folder? Your original site pages neetd to be uploaded to your root folder
Do you have your first page named default.* index.* *=(.htm, .html, .asp, .aspx )? You can configure your default home page from your Control Panel.