Exactly, make sure that the SD its FAT32, and its less than 2gb, wilbrand and mostly hackmi installer, dont like SDHC, so try to install the exploit using a NON HC, if it works, glad for you!, but it mostly wont, so get a 2gb SD or less, just to install the Homebrew channel, and after that, just use a SDHC for everything.
So it wil be something like this:
SD:/boot.elf <--- this is the hackmii installer
SD:/Private <--- this is the wilbrand exploit folder
SD:/Apps <--- this is where all apps for wii goes, so the homebrew channel recognize them.
SD:/WBFS <--- games in .wbfs format for the wii