Classroom Management tips for larger classes?

I will be starting my student teaching starting in August. I will be teaching High School English. Normal class size at the school where I teach is 11 students. This semester I will have more than 25 students.

I am rather short, and I have a naturally soft voice, which are challenges I must overcome as a future teacher. I am excited about the experience, but I thought I would ask for tips anyway.

Does anyone have any suggestions for classroom management/lesson planning?

I think it’s important not to try and shout over a rowdy classroom… if they out shout you/ignore you, you will lose any respect they may have had for you in seconds. Stand still and silent making eye contact with the trouble makers until they settle down.