1. Don't point any gun at anything/one you are not willing to destroy/kill! This is forgoten to many times.
2. Get professional training from a reputable firearms instructor or school. Not just training on how to use your weapon but when its legal to use deadly force.
3. Have fun. Marksmanship activities aren't all focused on life and death. Look for USPSA matches, IDPA or whatever floats your boat!!
My humble advice.