"If I steal someone's burrito, you might call that wrong. If I help someone cross the street, that may be an honorable thing to do. But how do you know what is right and what is wrong, where do these notions come from?"
Ethics and morality are not easily defined districts of Philosophy. Compared to metaphysics, epistemology, or logic, value theory is more largely dependent on one's individual convictions. Hence, the question is not what constitutes a moral decision, but rather directed at the fundamental heart of morality: where does morality come from?
One's morality is therefore based on one's individual faith. If you value truth, to oppose that value is immoral. If you value family, the right decision is the one which benefits your family.
Subsequently, one may ask, where do our values come from?
Our values are a fusion of our family upbringing, our societal teachings, and the attained values determined by the experiences of our lives.
So if morality is rooted in values and values hail from various and indefinite places, then I suppose right and wrong are simply two ambiguous terms.
Many say there is a "right" and there is a "wrong." At times, two options have such obvious discrepancies that the terms are easily assigned. However, most of the time there is simply a decision, and a better decision. Hence, I would define the morally right choice as the choice which benefits the most people. The principles of the people do not necessarily matter therefore, but rather their wellbeing.