How to make a game work?

Hi, so i am making a game where a guy kicks a football through a goal post, my question is how can i make the football fly to different parts of the world like miss the goal post depending on when the user clicks a button, also how do i make a power meter for the kick power? I need the power meeter jump back and fourth and depending when the user clicks a button it determines the power and kicks at it and that determines the flight of the football....

I need some help to accomplish this.


Thank You