I would suggest not trying to make a game right away, but instead make a few simple programs to learn how to do things. First, learn how to move an object on the screen, then make a second object that chases after the first one,... then add obstacles,... etc.
Another really helpful thing is to go through the command index,... go through each command one by one, and when you get to one you do not understand then write a small program to figure out how it works. After doing this, you will know the language much better, and it will help you make anything you wish.
Another really helpful thing is to go through the command index,... go through each command one by one, and when you get to one you do not understand then write a small program to figure out how it works. After doing this, you will know the language much better, and it will help you make anything you wish.