ircd and static ip's?

I own a very popular adult forum and they are beging for irc. I use to be a irc junky but never really ran my own ircd server. I have irc running for one of my domains but it has its own ip.
My question is, I have the forum on a shared ip account. Do I have to set it to its own ip or just create a different user or can I just compile ircd within the same account?
Or just create a new account under cpanel with irc.domain.com as the site and leave the other account untouched?
I am so lost on how to do this.
If I switch the main account to a dedicated ip will there be downtime untill the domain points to the new ip? I have had a problem before when doing that the site would point to the server ip and get the apache page untill propagated.
Whats your suggestions?
A very huge thanks in advance.

-Dave
PS
Latest cpanel/whm EDGE
Redhat Enterprise 3
Unreal IRCD Latest with anope services. fyi

 

 

 

 

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