Generally, the earlier you get an attorney, the more they can do for you.

You can sue anyone for anything. The question is what are your damages and can you recover them from the other party?

How to get my plates back

Request Administrative Review of the License Plate Impoundment Order. If you don't know how to do this, an attorney can help you.

This is certainly possible and happens frequently. He needs a lawyer ASAP.

You could pay off whatever debt has resulted in the garnishment.

Impossible to say with the information provided. I can however tell you that confessing your crime publicly isn't a good idea if you're hoping to...

Does a parent need to watch their 18 year old child graduate from high school before they can legally move out?

Once you are 18 you are an adult and can do as you choose.

You should consult directly with an attorney who handles tenant matters for specific advice on your situation.

Generally, you can use reasonable force to defend yourself. Why not report the assaults to law enforcement so that it stops permanently?

Is trial by combat still a legal option?

No. Consult with an attorney to see about keeping this off your record.