How to set up your Email
Watch my video below where I teach you step by step on how to set up your email through cPanel on Hostgator. Once you have set it up, to access your webmail, go to www.yourdomain.com/webmail. The Roundcube option has the nicest layout.
How to set up Gmail to send and receive emails using your own domain name
If you want to have your email flow into your gmail account and still be able to send and receive with your own domain, check out this link which describes in detail on how to set your Gmail to send and receive emails using your own domain.