Fitzypoop

Hey all, I'm new to scripting and there's a few things I want to do but I have very little idea on where to begin or what script codes to use. First, I want to make it possible for my avatar to "become invisible." I don't know if it's possible for the entire avatar to go invisible like prims can so I'll settle for shoving him underground. The type of script I'm looking for would allow me to click on an object which would then cause the avatar to "disappear." How would I go about doing this? Second, I have been able to make prims appear and disappear on command through the chat box. Unfortunately for what I want to do this process is too slow. What I want is for the object to appear when my avatar starts flying and to disappear when he stops flying. From what I've seen through searching, the CONTROL code works with button presses but all I've seen has it working with movements and mouse clicks, not the F key for flight. I'm mostly looking for someone to tell me what to do so I can figure it out from there. Any help would be greatly appreciated.