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I recently heard about the ''Discipline Without Stress'' syste. Has anyone tried it? Is it effective?

I am about to graduate and start my career as a high school English teacher. Most likely I will be working with 9th or 10th grade. I am worried that my students will not see me as an authority figure because I am so young. Does anyone have any first day of school tips to help me set up the right dynamic in my classroom?