Depending upon the state and county of your first time offense and arrest for possession of marijuana which is a misdemeanor, you possibly could be sentenced to up to 6 months in jail and/or a $1,000 fine if convicted.Realistically, you will probably be fined $750 or so, placed on court supervised probation and sentenced to do community service work if convicted or you plea to the charge. There is a chance that upon successful completion of the community service sentence and probation, the plea may be allowed to be withdrawn and the charge dismissed.You should consult with a criminal defense attorney about this matter.