DNS - registrar settings for a multiple domain setup.

I have just switched my VPS provider and reinstalled CWP. I cant for the life of me recall how I got DNS working before.
I have a root domain registered.. and that domain  i use as my DNS server. I also have a couple of other sites hosted. Alas all of them default to the CWP default page...I have removed the index.html but no joy.
Lets say my default site is mysite.com
On my domain registrar, do I need to set my name servers as mysite.com for a second or third hosted site or should they be second.site, third.site ?

Sorted it, it was the NAT local IP. My VPS provides me with a private and shared ip...I needed to add my private ip address -> here for anyone else that may need it http://wiki.centos-webpanel.com/default-page-displayed-for-all-domains