What punishment should i expect?

You retain a local DUI lawyer to fight it. has a terrific "find a lawyer" tool.

For starters, work hard at school or your job--judges frown on people they see "on the way down" and will figure they need a 2x4. Stay away from alcohol, weed, anything that intoxicates--you'd be surprised how many people waiting for a hearing on dui get arrested for the same or possession. But it's serious so get a lawyer. You'll have to surrender your license, face a suspension. Then the penalties roll in.

You should call an attorney who does DUI cases and make that call today. It is possible to have your case moved to Juvenile Court and effectively dismiss the charge so for the rest of your life you don't have to check a job application that says you've been convicted of a crime.