Morality and ethics are similar concepts, but not exactly the same. Morality is the ongoing practice of deciding what is right and wrong, and ethics are the rules that one forms to figure out what is right and wrong. So the best way to start is to find the theory of ethics that makes the most sense.
If you are familiar with arguments in favor of virtue ethics (based on being good, not doing good), deontological ethics (one’s duty), utilitarian ethics (that which produces the greatest happiness), and rights based ethical systems (in which it is best to respect people’s rights), which of these makes the most sense and why? Do you prefer some combination of these? Or something else altogether?