There are no requirements.
Go to your local police station and tell them you want to file for a restraining order.
They will give you all the necessary paperwork right there. You will have to fill out what he has done and give his information. (address, appearance, etc)
Most times, they can fax it to a judge immediately and determine if you qualify for an emergency ex-parte order of protection. If that is granted, it's like a temporary restraining order. I see no reason why it wouldn't be granted.
You will be given a copy of that order, and he will be served with a copy.
You will then be given a court date for both of you to appear at and give your sides of the story. The judge will then determine whether or not to grant a full restraining order.
Good luck. Feel free to email me with any questions. I have been through this with my ex-husband twice now.
If your brother lives in the same domicile as you, it's going to be hard to enforce a restraining order. Don't you have parents who can take control of the situation? If not, talk to your school counselor about it.