I don't see the point in setting up a complete IRC daemon just for one forum; you'll be wasting a lot more resources on a server that'll probably end up having 10 users and 4 channels max.
Just create a channel on an already existing and populated server, like Undernet. At least that way you won't have an empty server and will have more advertising for the forum when users join your channel.
I can understand your desire to have a complete IRC network dedicated to this forum and your dream of it being populated with thousands of users, but that just doesn't happen.
Don't even get me started on the security issues you'll face.