First Week of Student Teaching

This week was my first week of student teaching, and hence I have more hours of classroom time than I had in the past semester, and in two more weeks it will be more than I had in the past year and a half. I don't know, I just feel unprepared for actually teaching. How do I pace a unit? How do I assign homework from a textbook? How do I actually see all of my students working when I'm writing on an overhead and the light in my eyes makes it hard to see anybody?

I'm glad I have my cooperating teachers to help me along the way, but I still feel like these things should have been emphasized in my program (not the overhead thing, but the others). How do you actually have time to cover material when periods are only 50 minutes long and students take about 5 to settle down? Classroom management was something we talked about a lot in our classes, but it doesn't help to "practice" them on ourselves since everyone in our program knows how we should act, we need to be in a classroom. I want to be a successful teacher, and I know I will be always learning about how to handle my class.