What happens in juvenile court?

I was being real stupid and stole from a store,they caught me and i was arrested but set free that night. The police officer told me that i would have a court date and i would have to go and if i was arrested again i would go to juvy, but what happens in court? This was the first time i did anything bad and im worried something bad will happen to me. And what happens to my driving permit? Please someone help me! Tell me everything you kno that might happen