what ns to use ?

[kob3]

thanks for the response , this is what i want to do so i used co.cc for that A record and i made an subdomain with the folowing settings :
Host : ns1.***.co.cc
TTL : 1 day
Type : A
Value : my ip adress

now i will add ns1.***.co.cc to my domain nameservers . My questions are : do i need a secondary ns ( a secondary zone record ) ? I must remove the other ns from the domain namservers ( I have the ns1.***.co.cc and an other namerserver from an another host ) ? What i must do now to my ispcp server , i need to modify some files ?
Soory caz' i don't know so much about ispcp and linux servers but i want to learn . thx