Well, I've read the DNS section of that tutorial quite a few times since you posted it. It's too advanced and it doesn't explain the basics, it assumes you know quite a bit
So far I registered swinger.homeunix.com (dynDNS) and made it resolve back to my real IP address.
I want to be able to go on IRC with that domain. I know it can be done because I see other people online from the *.homeunix.com domain and from many other free domains that dynDNS lets you register, like *.is-a-geek.com
Once I get it working with that swinger.homeunix.com I will register my own domain and use that for IRC. At the moment I don't know what I have to do my end to get it to work
I know I have hosts and host.conf and many others which I probably have to change to get this to work, but I don't know what to change them to. Whenever I do a search for "virtual host" or whatever, only instructions about setting up Apache with virtual hosts comes up, and that tutorial you posted is way too complex