As far as reading about ethics goes (and the fact that different states have very different laws), this book does a good job of overviewing the 5 ethical precepts underlying ethical behavior (maleficence, beneficence, fidelity, justice and autonomy)...and how they should interact with the ethical codes of your profession.
Also, there was a special chapter just for me: school counseling. (It didn't answer all of my questions....but that's a state-specific issue too...)