my wii can play burned games. I saw that if you update the wii it will erase files that used technical modifacations if you update it. Since there is a chip in my wii to play burned games,will the wii automaticly erase the files and my data?

Here's a list of the things you'll need:

Nintendo Wii
SD card - a 2gb or 4gb will work fine. Also make sure you have a SD card reader - most SD cards will come with a reader or your computer might already have a SD reader built in. DVD-R discs - We've used the Maxell 16x DVD-Rs and they worked perfect! Ok, now that you've got the checklist, the first thing to do is to install the Homebrew Channel onto your Wii. The Homebrew Channel is what makes everything else happen. You'll be able to install homebrew and commercial .wads and also install the Backup Launcher which will allow you to play backup games (both homebrew and commercial).