How do I make a virtual joystick that controls angle?

I need help creating two virtual joysticks that control player movement and angle. I basically have two sprites, A player sprite and a Arm sprite. The left joystick will control the player sprite movement e.g. move left/right, jump, down. And the right joystick will set the Arm sprite angle and will shoot when the joystick is set to a certain angle. I don't have a Capx to show because it's very complicated to implement this on my game, and I don't know where to start.

Any help is appreciated, thanks in advance.

https://www.dropbox.com/s/1ldiechf7kd6de8/vj.png?dl=0

This should be a good start:

And you'd probably wat to implement something like this:

https://dl.dropboxusercontent.com/u/485 ... ollow.capx