Normally the law school will ask you for a list of references. Often they will also want the addresses and mail their own special form to the people you listed.
Sometimes, they won't do this, but ask you to mail in copies of references. If this is what they want you to do, then you should approach teachers, counselor and even any lawyer friends that you have, and explain to them what school is asking for references.
Sometimes the person writing a reference will give their letter to you to mail in, sometimes they want to mail it in themselves. Not everyone wants you to see what they have written.
If they give you their letter personally, or mail it to you first, make a copy of it, so you may use it again, for another law school.
Often letters of reference are written "To Whom it May Concern", and sometimes a letter is written, addressed to a specific school, or person there.
So, I'm sorry to say, no really one way to do it. That's why often the school needed the references will send out their own requests to people you have given them.
I'd call the school you are planning to attend, ask for "Admissions" and ask them exactly what information they would like to see in letters written by your references, AND IF they will send out their own "questionnaire" or form.
For any letter of reference written, it should be on either letter head paper, dated, and also specifically identify for whom the letter is written, how long they have known you, and what they know about your skills and character.
Most professional people understand letters of reference, they have written many of them,for several different students, friends, or colleagues. So do not be shy about asking them, but please follow up to make sure they have submitted them in a timely manner. Most will give you a copy of the letter, but you may have to ask for that too.
Look a few up in the local phone book.