How to handle a juvenile unlawful possesion of a firearm charge and reckless discharge of a firearm charge?

You might be able to have your son released to you by posting bail or even on personal recognizance. If you can afford a lawyer, hire one now and have the lawyer try to arrange for discharge so he doesn't have to stay in jail until Wednesday. If you are indigent he should have a lawyer appointed for him no later than his first court appearance.

Tell you son not to answer any questions by anybody except the lawyer you hire for him or his court-appointed lawyer.

As a 14 year old first offender with a mental health problem your son should not be facing the serious adult jail time you mentioned but you will need to get him a good attorney to be sure you can put him onto a juvenile treatment track rather than an adult punishment track.

You should check with the lawyer you hire for your son but it's probably best to only tell his school that he will be absent on Tuesday and Wednesday and you know about it not any details. There are provisions in the laws of several states that allow a school to indefinitely suspend, exclude or even expel a student charged with a felony.

He needs a lawyer immediately.

NOTE: This answer is made available by the out-of-state lawyer for educational purposes only. By using or participating in this site you understand that there is no attorney client privilege between you and the attorney responding. This site should not be used as a substitute for competent legal advice from a licensed professional attorney in your area who regularly practices in the subject matter which your question is about. You should develop an attorney client relationship with the lawyer of your choice so that your communications will be subject to the attorney client privilege and have the other benefits of a professional relationship. The law changes frequently and varies from jurisdiction to jurisdiction. The information and materials provided are general in nature, and may not apply to a specific matter as partially described in the question.

Respectfully, Avvo.com can only start you in a direction, and in this case, you need the assistance of an experienced criminal defense lawyer who handles juvenile matters in MN. When you are interviewing the lawyer, ask if the lawyer has experience with this type of medical condition, and particularly with its use in the defense of clients.

In many State's, this type of situation can be used to mitigate the outcome (the sentence), if not the disposition or adjudication of delinquency. One notable problem you should discuss with the lawyer is the fact that your son appears to be having recent bouts of depression and has not been medication compliant. Both are issues I would be very concerned with as a defense lawyer. Good luck.

DISCLAIMER
This answer does not, nor is it intended to, create an attorney-client relationship; or, constitute either legal advice or attorney advertising. Rather, given the nature of this forum, it is offered solely for information purposes, as a starting point for you to use when speaking directly to a lawyer in your State. Do not assume that the legal conclusions I mention that pertain to NJ are applicable in your State. Since the facts of each case are different, it is critical for you to consult with qualified counsel with whom information can be shared and assessed under an attorney-client privilege, so that competent advice can be obtained on which you can make informed decisions. Contact an experienced criminal defense lawyer admitted to practice in your State before making any decisions about your case.