What is My Charge for Assault

My question involves criminal law for the state of: new york
what will happen to my i am a 15 year old male no other charges i assaulted a kid for threatening my couzin and my couzin is autistic

While wanting to protect your cousin is certainly admirable, you can't go around beating people up.

Assuming that all you did was administer a thumping and no weapon was involved, you're probably looking at fines, probation, and community service. If a weapon was involved, it will be considerably uglier.

You really need to consult with an attorney prior to your court date.