You will be doing your job as a leader when the members of your group are working together toward a goal which they believe is desirable.
What kinds of goals do the members desire? What kinds of goals appeal to the members of your particular group? In what way are the goals of organized groups determined, maintained, shared, altered? How do you as a leader know that your goals are attractive? How are you able to determine this?
Bear in mind that there may be different sets of goals that will determine the framework within which you must function. You will have your own goals; these bear the stamp of your philosophy of life, and one of the reasons, certainly, why you have accepted the leadership of the group ...