Looking To Set A Restraining Order

Hey, I'm looking to set a restraining order on someone from my school for sexually assaulting me, stalking me and overall harassing me, my principal told me my assaulter would be forced to transfer schools due to the restraining order.

i would like to ask how long that would take for it to be filed against him and for it go into order and what kinda process should i expect to see due to my age.

I'm going to the police station with proper proof over the weekend because he's continued to harass me and my friends even after being suspended.

To note this person has sexually assualted mutiple people not just me and has a past history of this behavior.

I have my family involved since my father is the one taking me to the police station.

Thanks for any advice you guys are able to give me!

Im also a sophomore in high school to give you age range (15-16)