Everyone new to Game Maker should read this well-written article by Rick_Slick at the GMC.
Computer programming is more often an art rather than a science. You can read all the books on computer programming that you want, but unless you’re one of those people that just pick things up right away, the only way you are going to learn computer programming is to sit down and do it. This means trying different things, reading through the tutorials, tinkering with existing code to find out what the effects are, adding your own code to get the desired effect, and so on. Just like you can’t expect someone to read a book on how to repair televisions and then automatically know how to fix every television you sit in front of him, you can’t expect to learn computer programming overnight. It takes time, patience, trial-and-error, experimentation, and a willingness to learn on your own. I would be willing to bet that some of the top game makers on this site who have completed some of the most popular GM games available are all self-taught. That doesn’t mean they never came here asking for help with how to do something, but they most likely didn’t have anyone spoon-feed them an answer either.