Cannon brick breaker game

Hi guys. I have the basic canvas drawn out for this game, but am lost on how I am supposed to get it to shoot and break the bricks, as well as set up the cannonball speed and timer.

I cannot figure out how to get the ball to start at the position of the cannon, as when i try to insert position it caps out halfway through the canvas and move any more to the left. I also cannot why it does not clear the full rectangle, as I have it coded to do so.