Then other anons on this thread already gave you some good answers, however:
First of all, let go of your preconceptions. MMO structures means nothing, you are still playing a character in a fantasy role-play game.
Your class role tells you what you should be expected to do in combat. It doesn't define you any more than that. From the mechanical standpoint, look out for what makes two classes in the same role play differently, and find something that suits you.
Don't worry much about chargen. Keep your main stats high, avoid options that go the other way, and you're set. You'll find guides that rate powers and stuff, but the differences are not that big. Don't worry about making mistakes.
Work with your party.
Have an idea of a character concept when you start making it. There was a ton of stuff in 4e besides the PHB. Some concepts might not be apparent but still have options in secondary sources. However, keep in mind that the baseline is competent action adventurers. Your character will be one, any way you build it.