This helped me to get it running on the OG wii. I used FriishProduce to make the wad and used the snes9x gx injection method. I'm able to launch it right from the wiis homescreen.
For any OG wii users, if that sounds too hard or you can't figure out FriishProduce, you can just use snes9x gx from the homebrew channel to play the rom.