Do I have to testify?

You're under no obligation to testify absent a properly served subpoena

Warrant of misspelled name?

Yes - it sounds like they missed it. Information put into a computer is only as reliable as it is accurate.

Even the arrest itself can be a parole violation. It is up to the parole officer whether they will violate you based on all of the facts but they...

It's doubtful that it's a scare tactic and much more likely it was miscommunication.

The closeness in age will affect what a prosecutor can charge it will not make the crime exempt from prosecution. It is still a crime until both...

Will I be able to get a restraining order against my older brother?

If he's hitting you and leaving marks, you can report it to the police. When he is arrested, a judge will issue a restraining order.

What should I expect if I got caught shop lifting at a store a second time and this time I got arrested?

It sounds like you do not have the money to hire an attorney so you will need to ask for a public defender who will try and get the charges...

Will you be arrested for embezzlement under $1000 in New York?

You'd likely be arrested or asked to come down to the station for questioning and then be arrested regardless of what you said.

If I plead guilty, Will it show on my record as I am going to apply for medical school or anywhere I work?

Hire an attorney and fight this. It may be possible to get the charge dismissed or to have a plea to something akin to littering instead of the...

Can I visit my friend in prison while I am on misdemeanor probation ?

You shouldnt do anything without speaking to your PO. I don't think you will be allowed.