If you want to check in on your players, one thing you can do is make sure they cite all of their sources (book, page number), and you come here and post their character's class levels, feats, spells/abilities, and equipment. We can EASILY tell you if something isn't legal, or is legal but outside the realm of respectable play, and why. Then you can go back and talk to your players and ask why they chose something and what they expect to do with it. If their intent is to break the game or abuse a mechanic, THEN you as the DM have the right to disallow it.

Think of us as a review board of accountants that check your taxes. Except we do it for fun. And free.