I will try to be more clear for you. What you did was wrong. But in NJ it is not a crime. It is just a "disorderly person's arrest."
Yes, if you go to trial and lose the case you can go to jail for up to 6 months. But you probably will not want to go to trial. If you don't go to trial you should not have to worry about jail.
If you plead "guilty" you will get probation. You can plead guilty and get probation on the next date if you want. Or you can wait and see what's on the video before deciding. On a case like this, I'm sure that you should still be able to get probation even after seeing the video. The longer your case lasts, however, the more you will have to pay your lawyer for his time.
Your lawyer is giving you correct information, so don't be scared about that.
If you finish probation and don't get arrested again, this case will not cause a problem with USCIS, so long as you tell them honestly that you got this conviction.
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