Well the easiest thing to do these days is use the Hackmii Installer. You can find it pretty easily through a google search. You need a free SD card to put the files on, and then basically it's distinguished mentally-challenged fellow easy to install. With it, you install something called Bootmii, the Homebrew Channel (which you can use to search, find, and download applications and also launch them) and DVDx which enables your Wii to read DVDs. Through HBC you can get something called a USB Loader and...well, yeah, that's pretty much it.