Help please. shoplifting at age 18?

okay I shoplifted a month ago.. and my court is in a few days. i was with minor friends and im 18. we admit that we kinda planned it.i went to jail and got bailed from 25,000 dollars. so please, help. i do not know anything or what to do or say in court. its my first offence so please tell me everything step by step. and the things that i stole in total was 50 dollars