Christians face the same problems and temptations as everyone else. Having your students prepared to face those problems and temptations should be a primary concern in your Sunday school. Good materials will help you apply the Bible to your life situations. Each denomination has their own traditions and special ways of interpreting the Bible and Christ's teachings. Although most lay persons don't want to be concerned with the many theological differences that separate the denominations, we still should be careful that the things we are teaching in our Sunday school class are compatible with the teachings of our church.
Good discussion is one of the keys to a good class session.
If not, the teacher will have to do extra work to make the lessons truly effective and interesting. Ideally, teachers should spend quite a few hours preparing each week's lesson. In reality, most teachers have no more than an hour or two to put it all together. No two classes, just like no two people, are the same. Teachers come to know what works and what doesn't work in their classes.