I would also recommend new players try to play each free rotation champ you haven't played at least once. A huge part of the learning curve of this game is knowing how to play against every champ as well as knowing your own. Remembering from that one time you tried a given champ out that he has a dash, slow, steroid, and wicked stun ult (or whatever) is huge when going up against them. Fights happen so fast that when you're new it's easy to miss what your enemy did to you sometimes, especially if it was a steroid with no obvious ability particle effect that raped you. It also gives you more access to finding champs you'll want to put in your personal rotation. So play each once and then stick with your favorites.
