Just be yourself.
Be friendly to the new people you meet, and try and become friends with them!
I remember the time i first started secondary school/ high school , i was soo scared cause i new nobody!! But after a while i found friends! So you just have to take a few deep breaths and walk into the school with your head held high, that will make you feel confident and calmer ;) good luck!!
And its fun , so enjoy yourself!
TBH on my first day of high school I was really shy and just sat it the corner alone... no one wanted to be my friend... but as soon as i started being my loud bubbly self loads of people wanted to be my friend!!
