I have a game idea, not sure where to go from there...

Hey good people of HN,

I have a game idea that I would like to bring to life, but am not sure how to proceed. Do any of you know of a site where I can find others to work with on this idea? I don't care about making any profit on this, I just want to create a fun game.

It's going to be a 2d beat-em up game where all the characters will be using musical instruments as weapons. The characters to choose from will be a brute (bass player, strong but slow), the average knight-like player (guitar player, somewhat fast and semi-strong), ranger (singer, fast and favors attacking from afar with microphone - thus "ranger")...maybe even a drummer as a bonus character.

Any help would be appreciated.