AU is Alternative universe, that's when you place the characters of your story in a different world (like Heroic fantasy) or a different situation (like, SHINee aren't singers but students, policemen or stuff like that).
No rating is fine for a story without any scene, without violent scene or highly depressing topics. It is mostly for sweet, fluffy love stories.
Pg-13 means that the topic can be a bit ual or violent (nothing very graphic though... You just hint at a ual relation, for example)
Pg-17 means that the story contains very explicit scenes, violent scenes (, beating, self-harm, bloody fights, and so on) and that it can be shocking for young/innocent/sensitive people ^^
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