>I did notice that they started getting a little
>noisy today, and a few started to get out of their seats. Tomorrow I need to
>remind them of the rules and explain that I will be writing up any student who
>gets out of his or her seat without permission. I need to nip this in the bud
>before it gets out of hand.
Continue practicing the procedures every day, not just reminding them
verbally, until it becomes a routine. It may seem like you're wasting
class time, but it will pay off in the future when you're not having to
continuously stamp out little fires.