The Middle School Teacher's Guide is an excellent tool that provides stimulating lessons designed for a wide variety of students. Middle school probably represents the most diverse age group you'll find in terms of personality and cognitive ability.
A reflective "Teacher Devotional" prepares your heart and mind for the study, a short "Understanding the Bible" article helps you gain perspective on the Scripture, and a section on "Classroom Tips" makes your class time run more smoothly. There's also a pre-session activity for students who arrive early to class.
Each four-step lesson plan starts with a "Lesson Focus" that is applied in each step. Then, you have an easy-to-follow guide that will take you step-by-step through the lesson.