It is a good idea to read the Wiibrew FAQ before proceeding. All homebrew tools can be found for free on the internet; these kits simply repackage these free tools.The first thing you will need is an SD card and an SD card reader connected to your PC.The Nintendo Wii was introduced in 2006 and, since then, over 100 million units have shipped.
The Wii was not designed by Nintendo to support homebrew.
There is no guarantee that using homebrew software will not harm your Wii.
However, because all of this developed over time, as I mentioned above most of the information out there related to Wii hacking is either dated, incomplete, or conflicting with each other.
As my small way of giving back and giving thanks, I put together my own HOWTO covering the most important details regarding exploiting the Wii, setting up your hardware, then installing and configuring Wii Flow for maximal enjoyment.
It is a good idea to format your SD card before you begin; I had a number of problems with homebrew applications that were fixed after I reformatted my card.