There's a free game design course online right now. There's apparently about a thousand of us already signed up, with a waiting list for more, so if you go to sign up, it might take a bit. But if you are at all interested in making games, I would highly suggest taking a look. He does require a book, but it's pretty inexpensive. All the requirements are listed on his blog. So check it out. You can't beat free, right?