I will also say, as a double-post, I am far more campaign-oriented than scene-oriented as far as my GM-ing rules go. Scenes don't really need rules. Take an idea, run it. People will like it, it'll be resolved, or they won't and it won't.
Ultimate rule: Learn by doing. If you want to run a thing, run it. It might not be your magnum opus, but every attempt is one more step to mastery.