Beginning a lesson
To begin a lesson, it is crucial to immediately engage the students with something interesting or fun. Students need to value their education and actually want to learn. They need to think that you are going to teach something worthwhile and that they will enjoy the lesson.
An important idea to remember is that students will rise to the expectations you set them. If you believe they will do well then they are on the way to doing so. Conversly, if you don't think your students can achieve then they will not achieve.