At the beginning of the lesson we need to get the attention of the students. One way of doing this is to do something dramatic . We need to relate to the students and include them in them in the process. I would choose something concrete that they can relate to.
This would then introduce the topic I could act out something like if they were studying about health I could act out having a broken leg. Go in confidently , highly organised and blind, deaf and dumb and dont react.
The first two minutes is crucial to the lesson.