My question involves criminal law for the state of: Missouri

Hi, I'm 17 which I think makes me a juvenile still. I was stopped by water patrol on a lake, and they searched my boat and found two blunts in my pocket. I was given a citation told to arrive at court and then they left.
I have had only a Careless and Imprudent driving ticket when I was 16.
Can someone please tell me what kind of punishment I am looking at, and/or if snitching would be an option.

Thanks, 1st time offender