How to make a certain video game on Game Maker 7.?

Anyone remember the old time Super Nintendo game "Super Mario RPG- Legend of the Seven Stars"? Well, I was wondering if anyone knows if there are any online pdf's or books that I could read up on to learn the codes that were used to make the game. I would like to recreate one on Game Maker 7 with my own story plot (or a similar game) for my own entertainment. Any help will be great, thanks!