The most basic maxims of normative ethics are to maximize truth, minimize harm, and act independently.
Seek the truth and report it as fully as possible (maximize truth). The facts is that a journalist is in the business of telling the truth. Therefore:
Inform yourself continuously so that you can inform, engage, and educate the public in clear and compelling ways on significant issues.
Be honest, fair, and courageous in gathering reporting, and interpreting accurate information.