how do i make a gun

if i have a bullet shape, a gun and a script that should make it fire but it doesn't work. is there somewhere specific i have to put the script and do i need to do anything else with the game. tell me if you need the script and i will post it. thanx

Here's a similar question that should help you get started. http://answers.unity3d.com/questions/5602/fps-gun-accuracy-bullet-tracers