How do?

how would I make a game like this with flash???Gravity and all…

This is the game

Plz help I have looked and tried but nothing worked

Like basicaly I want to
-be able to draw ground in one frame, then be able to select play and it places a movie clip of a ball rolling down what ever your drew, and it rotates depending on it’s speed.
-And I also need the screen to move with my ball.
(JUST EXTRA: How would I be able to put different skins in so people can select what type of ball they want?)

If you help I will put ur name in the credits of the game.

You can give me a link to what can help me and I will still put your name in the credits