My son is being charged with a class a misdemeanor for alleged delinquent minor what will happen

You need to hire an attorney for your son right away. If there is an allegation of a sexual nature., the charges will probably be upgraded. Find a criminal defense attorney who is experienced with handling juvenile matters. DO NOT discuss your son's case any more in public - whether here or anywhere else on line or in person with friends or relatives. The lawyer is the only one with whom you and your son should discuss the case.