Ok, so I've created a map, and I've downloaded the REO2 thing, and I'm able to use Dream Deamon with it to host it. I see it on the hub when I'm hosting... but I don't know how to do anything once I've gotten there. Do I need to type in commands?

Using Dream Daemon takes the place of the host. This way, you can enter the game whenever you want, or host the game without the lag from running your Dream Seeker as a host along with your character. If you want to be able to do anything, you will run it normally and put yourself as an Enforcer, or Admin. After that, you can run Dream Daemon and get on the Enforcer/Admin key and then you can pull the commands from the options you have. All you do is click "Start Option" command, and viola. You can now load maps and change everything. Also, if you get tired of playing, and don't have anyone else as an enforcer, you can turn on Auto-Host. That'll work on the next time the game is started up, or at the end of the next round. That's pretty much it. Enjoy and may you shotgun many a-zombiez.