Josh Harris has a great post on sermon preparation:
“Call the congregation to act! Our expectation as the sermon comes to an end, is not merely that people will understand or remember or enjoy our teaching, but that they will do something about it. If there is no summons, there is no sermon!
Consider the composition of your congregation. It is good to let your mind wander over the church family and ask prayerfully what message God might have for each from your text. Consider their unique circumstances, weaknesses, strengths and temptations. “