Step 1: Software/Hardware needed
A VST Host (i use FL Studio 8) but you can get a free one here:http://www.hitsquad.com/smm/programs/VSTHost/
A GH Controller, and an adapter if its not for Xbox 360 or PS3
MIDItar Hero (this is where the magic happens)
MusicLab's RealStrat (not free, unless you know what a torrent is)
GuitarRig 3 VST (also not free, unless you use a torrent)
A MIDI Loopback device: I reccommend LoopBE1
and any drivers you might need to get your PC to recognize it as a joystick.