DNS question in regards to /etc/resolv.conf

[Alden Louis-Pierre]

Hi,

    I'm in the process of registering with either www.godaddy.com or 
www.dyndns.org for a domain.  Now when it's time to set up my
/etc/resolv.conf, am I suppose to continue using the nameserver that's 
provided by my ISP or the people I registered my domain
with will give me there IP address for there nameservers?  I'm trying to 
learn how to build a web and email server. 
As always if someone knows a better register besides the 2 i listed 
please free to inform me. 

Thank You
Alden Louis-Pierre