My question involves criminal law for the state of: Petty Theft

In the beginning of December me and my friends were caught shoplifting in Sephora in California it was marked a misdemeanor. I turn 18 in the end of February and my court date is in the first week of February, will i be tried as an adult? even if I am going to juvenile court?. I took around $180 in makeup and left the store and the store security guard brought caught us and brought us back into the store. After we were then transported to the police station in the mall, were they detained us and gave us or slips. My question is will i be fined and around how much because i have to pay for it, also what other repercussions will come out of this like jail, community service or what not?. Should i hire a lawyer still even if they have the security tapes. This is my first offense, no parking tickets or anything