How to starting your first class?

It is normally if we felt nervous when we have our first time to teaching. I felt too.
My first class was primary 4 with 25 students. I was remember that my partner asked me to teach science. Did she kidding me? I am majoring in Math, i have no experience in science yet.

Ok, the class must go on. I still have 30 minutes before the class. So, what i did at the time?

First, take their notebook, what topic that they have learnt?
Second, try to remembering what are the unique things that relate with their topic?
Third, Don't give them directly about what will they learn in science, give them clues.
The last but you must do first, introduce yourself in best way.

to be continue