It is a lot of hard work and dedication to make a game, but first I would start by creating your game studio, on your computer.
By game studio, I mean the software you are going to use to create your masterpiece, like a paint program, a 3D model program, are you gonna program the game from scratch, if so, you will need a compiler like dark basic pro, if not, then quikly game pro, or fpsc, or game maker, then, read as much on the systems you can and learn.
Remember, start small, then work towards your main idea.
My Forum@ I am starting off a forum on game making, trying to help new people however I can, and not put them down coz they are new, if you have anymore questions, you can post there, and I will do my best to help.
Aone.
http://www.aoneweb.com/network/