(beginners questions)questions about demos and other stuff

help plzzz.
tnx in advance.
1.)is it possible to look upon the codes in game demos.???? and how do you make the game into an exe(as a finished product).
2.)how can i put a large image as a background.
I tried making an actor then adding animation but my picture wouldn't show.
3.)is there an easier way getting rid of moonwalk bug. and if not can anyone make me a code without any moonwalk bug for moving left,right,stop_left,stop_right,jump.
4.)where can i find the syntax for codes in GE?
5.) how can i add a mouse function in the game, and maybe changing the mouse cursor it self.
(XD)
sorry for bugging anyone with this simple questions, but i really needed some help. 
tnx in advance.
1.)is it possible to look upon the codes in game demos.???? and how do you make the game into an exe(as a finished product).

2.)how can i put a large image as a background.

3.)is there an easier way getting rid of moonwalk bug. and if not can anyone make me a code without any moonwalk bug for moving left,right,stop_left,stop_right,jump.
4.)where can i find the syntax for codes in GE?

5.) how can i add a mouse function in the game, and maybe changing the mouse cursor it self.
(XD)

