Can not get Wordpress Multisite to Work

I am trying to setup Wordpress Multisite to work for sub domains on newly installed wordpress . I am using hostgator for hosting and followed the instructions on wpmudev website and hostgator site but still can not get it to work right. I called Hostgator and they told me that they support multisite but they are not trained to help with installing that. I added * as a wild card sub domain. Changed htaccess and wp config files with the instructions from Wordpress and wpmudev and installed the multisite network but still see on the new sub domain site i am creating just a blank page saying Index of /cgi-bin/ and can not access dashboard of new sub domain (Giving me 404 error). Can you please help?