Setting reseller in WHM/cpanel

Domain is registered and this domain will be used for nameservers registration at domain registrar. This nameservers will be used for reseller custom nameservers.
I opened an account opened with this domain name and I gave permission for this account to became reseller. The thing is that when I opened this account this account is associated with main server nameservers. Is this OK or this reseller account must have their own custom nameservers which are registered at domain registrar ?

Further more......I set nameservers for this reseller and set A record. is this enough or I must enable nameservers somewhere else ?

And is it OK to set shared IP address for this reseller but with the same IP as their primary nameserver have ?

 

 

 

 

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