Get to know your teachers a little bit more try telling them what you are good at and a little bit about yourself
Ask people when you they have lunch and you have lunch with them try asking if you can sit with them at lunch
Remember it's your first day so you may not fit in the first day and may be called "the new kid"
Be nice to everyone because they may be your future teacher/friend
Ask for help when you need them most this is a good way to meet people and get to know them a little better
Try not be mean remember if you get someone to hate you their whole group will probably think bad of you too .
Pay attention in class remember this is your shot to prove to your new teacher that you are a new student
Be nice and try to being open and talking to everyone