Actually, there's a great one here, so I don't have to:
http://wiibrew.org/wiki/Setting_up_your_Wii_for_HomebrewThat's the one I followed. That WiiBrew Wiki is excellent.
I also highly recommend the Homebrew Browser:
http://wiibrew.org/wiki/Homebrew_BrowserIt's like a VC store for homebrew (that's free!). It lets you download homebrew directly to your Wii from the Net, and it will keep it up to date for you. Awesome, awesome.
I also got the NES emulator working; it's great. So is the SNES one. I'll try to the Genesis one soon.
Benj