Go to www.multiwii.com
this gives you the basics of the multiwii board. The multiwii board is different than the KK board, and is the board used by Foam and Tape for the QTR vtol you say you want to build. F&T and RCvertt have successfully built the QTR vtol. I have built one, photos and video are posted earlier in this thread. RCvertt has helped me with my project but I haven't gotten everything working yet but I'm close. I think if you read this thread while you build the board using the multiwii web page, you will learn a lot. The plans are posted for the airframe.
I am needing help with the code to get my tilt servo and my ailerons working. I am also waiting for a replacement for a bad ESC.