Step 1: Berryboot
Step 3: Berryboot
2. Setup RPi with Raspbian Wheezy (first option).
Step 4: WiFi Dongle
If you have difficulty with manual WiFi dongle setup, you might try this video.
Lastly, if you are looking for a WiFi dongle for cheap, with good range, and uses very little mAhs (the Pi can only feed about 700mAhs through the USB port). You might try this one, $6.17.
Step 5: SSH
You have to plug in your Pi's network number. You can find this by pulling up your wireless hub's configuration page. You should see what address your Pi is listed at. For some strange reason, if it doesn't list the device name, just view the page while the Pi is up, then unplug your Pi and refresh the wireless hub configuration page. The device that disappeared is your Pi. I've never had to change the port number, but beware you might need to depending on your setup.