I want to make a game

I want to make a game that teaches people how to play guitar. Can you point me in the right direction to get started please

For people who may dig this post.
You could use FFT to get the frequencies from the input signal and quantize them to notes. Then you just learn users the patterns (chords, riffs, progressions, scales etc) by playing them (new Audio Engine has ability to Synth notes, chords etc) and then comparing user input to it.