Here are some written and video tutorials explaining how to implement elements of the Virtual Controls Suite in your project. Can’t find a tutorial for what you need? Drop by the forums or the contact page for some support.
Full Suite (NGUI)
Implementation of Joystick, Touch Button, and DPad from scratch (NGUI)
Note, for other UI solutions, the setup is the same, except you create graphics with your UI solution instead of NGUI. VCS Version 1.0.