While the connectivity kit would be useful it is not necessary and can be found cheaper elsewhere. According to the JungleFlasher tutorial, the USB probe will be of no help to you at all. You will need to do an MRA hack in order to get your key. You should read the JungleFlasher tutorial. You can find a download link to it here:
lt-lite-touch-download/jungleflasher-tutorial-for-ixtreme-t5.html.
The MRA hack requires you to cut traces and do some soldering. If you are uncomfortable with soldering but still want to do this yourself then you might want to look into getting an LT Switch as it will make the soldering part much easier. Either way, you're going to need a soldering iron, some solder, and an xacto knife.
You also might want to look into buying a Via 6421 based SATA controller card for your PC, as not all PC chipsets are capable of picking up an Xbox DVD-Drive.
You will also need tools for opening you Xbox and your DVD drive. A screwdriver set that includes a Torx-10 bit and some mini-screwdrivers will do.