Finally! The first week is done and over with! ...Now it's time to have a little fun. The first weeks is always gonna be rough, because you're just getting used to this new lifestlye and transition. The second week will go by much more smoothly. :] So let's start this off with....friends.
I remember during my second week of my high school, I wanted everyone to get a feel of what my personality was like. I started making more friends and showing them that little wild, and silly, side of me! I would tell them jokes and stories of what happened to me in one of my classes, or stuff that's happened to me outside of school, and the more I talked, the more friends I made. You don't have to make a lot of friends like I did, but it is good to have maybe a friend or two that you can rely on in each class. Friends make the world go round! 
I remember the first friend I made was someone I had met at my Freshman Orientation. We were one of the few freshman who didn't know ANYONE there, so we laughed and talked to each other. It was a little awkward at first, but it was worth it! At first I thought I wasn't going to get to see her again and I got a little sad, but then when school started, I saw her sitting right behind me in my honors algebra class! So that's why having a couple of friends in each class will make your day more exciting!
But one interesting thing that I've seen, even in these early weeks of school, is drama. Drama is something you shouldn't get involved in. Don't talk about people and don't make yourself look too "wild" so people portrait you as something you do not want to be portraited as. I'm trying to work on that myself and it's a little hard, since I've always acted like that around my friends, but some people (jealous people or maybe people who just like to irritate others) may try to break you down for that trait. I've had it done to me many times at my elementary school, and now when people try to destroy me internally, it doesn't effect me. High school will toughen you up and prepare you for the real world, so it's a great learning experience.