Urgent Help Please!

Hello, I've just purchased a dedicated server and set everything up. My name server IP's have been set at my registrar, and on the server it self. But..... My website does not display on www.kernowhost.co.uk BUT If i visit www.admin.kernowhost.co.uk my server responds with the domain! admin.kernowhost.co.uk is my host name? How do i make my domain and my customers domains work ?? Thanks guys!