how to setup nameservers

[RouterRat]

Let's say my hosting company is http://www.xhosting.com

So you mean I'll have the main server which is hostname web1 and it has hosts xhosting.com and some clients I can access it as web1.xhosting.com etc.

This server will have clients too like 4 or 5 domain.
So for this 4 or 5 domain, can this server be already the name server?

like ns1.xhosting.com and ns2.xhosting.com ?

Let's say I don't need 2 independend nameservers.

Currently I am just parking domains and changing A record to my web server's IP from registrer.

Can I use ispCP as a name server?