help I'm a noob!

So this is my first time programming with basic, self-taught, and I'm making a Space Invaders-type program. What I would like is for there to be a short intro with a little plotline (which I've already written), and then for the game to start. Unfortunately, the script I have will go through the intro, but then will end once it gets to the game part. There's nothing wrong per se with the script I have, but I think it's missing something to make it work...is there a way to make it reset everything and start with new code (so it forgets all the stuff in the intro after the intro is over, and starts the game)?

>>2

I mean, I make it clear the screen, and then I write the code for the game... but it just ends after the intro to the game ends. But, once the screen clears, I have the dimensions and stuff there, and I don't know if there's something else I'm supposed to write to make it recognize that a game should start. I can post the entire code for someone to scan if it's necessary.