My question involves criminal law for the state of: Atlantic City, New Jersey

Hello,

I was recently in Atlantic City, New Jersey and was arrested for aggravated assault on a police officer. I do not recall hitting anyone but the officer is claiming that I punched him. I think what happened was I was refusing to leave the premises and the officer pushed me and then I got in his face. When I got into his face another officer came from behind and grabbed me. I may have accidentally hit his face if I was resisting him but I really cannot remember. I definitely did not intentionally punch anyone...They are charging me with 3 charges.

these are the codes:
2C:12-1B(5)(A)
2C:29-2A(3)
2C:29-1A

I went to the courthouse yesterday and the Judge told me that my case is being processed and may go to the grand jury for a trial with a jury. I am 21 years old, this is my first offense. How is this most likely going to end? I did not hire a lawyer...do you recommend that I do? Any help is much obliged...