I am sorry to learn of your son's situation. I am very happy to see that you have retained an attorney to defend your son in this matter - your son should remember to follow their attorney's instructions, particularly with regards ***** ***** when to speak to law enforcement or the court - or which questions to answer at all. He should not speak to anyone else regarding his matter until it is concluded.
Regarding these offenses:
The first is a simple assault, depending on how the prosecutor charges this it is most likely going to be a misdemeanor charge which carries up to a year in jail, a fine, and probation (usually up to 3 years).
The second is "harassment", again, this carries possible jail time (but not usually imposed), a fine (more common), and probation.
Community service, or diversion programs may be utilized as alternatives when your son's attorney attempts to negotiate a plea with the prosecutor - assuming that your son is not pushing to get the matter put to a trial (contesting the sufficiency of the state's evidence, or challenging some other issue (such as a procedural matter).
Many times it is possible in a plea negotiation to get the charges reduced using a "lesser included offense" so that your son will not have an "assault" listed on his record, but rather something more mundane charge (I cannot tell you what the DA would agree to - this varies based both on the facts of your son's case and the local DA's policies).