The most important thing I learned is that soldiers watch what their leaders do. You can give them classes and lecture them forever, but it is your personal example they will follow.
First you train the followers to accomplish the mission. Second, you resource them: Make sure that they have the tools to do the job. Third, you reward them: You give them medals or bonuses.
Look for intelligence and judgment and, most critically, a capacity to anticipate, to see around corners. Also look for loyalty, integrity, a high energy drive, a balanced ego and the drive to get things done.
The chief condition on which, life, health and vigor depend on, is action. It is by action that an organism develops its faculties, increases its energy, and attains the fulfillment of its destiny.