I downloaded, installed, and ran everything in the install guide. I downloaded the WoW Trial Version from Blizzard. When I run, instead of connecting to my own IP, I think it is trying to connect to Blizzard still, even though I have done everything according to this guide.
Also, the Trial folder is only ~100Mb, and the full game is supposed to be a couple Gb. I cannot find where on the WoW website to get the rest of it, even though they tell you that you can, because the only difference between the trial and full version (according to their website) is that they block some content and want you to pay after 10 days.
Also, my goal is not to make my server public at all. I just want to play where I am the only player connected, if that simplifies things any. I don't want anyone else on it but me, one character.
edit begins here:
Ok, I got it to connect to my server using my test account! I'm not really sure what I did

I've been fooling around with MaNGOS as well, and several different installation guides, but so far this is the furthest I've gotten with any of them. However, now there are no realms to play in the list. I am able to log in, pick from normal/pvp/rp/rppvp, but then the realm list is empty.