Now I don't know if you noticed or not, but in the left side of the screen you will actually have a couple of quests right as you start off in the game! These quests will ask you to do several things, from completing stages, to much more. I really suggest that you stick to this quest line, because you will progress very well doing so. Don't go ahead and do random things, instances and whatnot before the quests ask you to, because you might end up not being able to complete that quest until the game resets and that is going to be quite a bummer! Just stick to this quest line and you'll be good in the game - you will level up, gain tons of rewards and finish your Daily quests (which reset every 24 hours).