Shoplifting in Texas

My question involves criminal law for the state of: Texas

I am 17 and I was caught shoplifting 25 dollars worth of merchandise in Target. The LP brought me into a room to ask me questions and take my picture. I answered without retaliating or anything. I did not have a driver's license or any form of identification, so they made me call my dad to come. I waited in a police car until my dad came, and the police told us that I have to appear in court.
What is the fine for this? I have seen sites that says it is 200 dollars, and others that say it is 500.
What type of questions will the judge ask me, and how should I answer back?
What happens afterwards?
How can I expunge this?

Are we talking juvenile court or adult court?

Read the stickied threads in this forum, and one of the thousand or so threads summarizing Texas expungement law.