Check out this video, it's very informative,
www.youtube.com/watch?v=Ao9iOeK_jvUDon't worry about getting crushed. It happens to developing players, and developed.. When creating games, you can specify low ratings opponents, although once you get going, it should not harm you to reach up a 100 or so above your own weight. You should try to take on better players to develop your skills.