Get to know the New Testament, its gospels and epistles (and prophecy), inside out. “Read, mark, learn and inwardly digest.” Make it such a part of your life that you won’t have to wonder, “What would Jesus do?”—you’ll know.
Read the Old Testament too—not that Christians are to live according to the Law of Moses, but in order to see the context of the history, culture and prophecy into which, Father sent Jesus. This will bring astounding clarity since most of what Jesus said either directly quoted or referred to the Old Testament. Connecting the dots between the two covenants will save you from confusing, time-wasting, even oppressive rabbit trails!
My son, pay attention to what I say; listen closely to my words.
Do not let them out of your sight, keep them within your heart;
for they are life to those who find them and health to a man's whole body.