A: Assuming you are not a youngster referring to your parents, or you do not own the residence or have a life estate therin, then yes, a person without a lease can be evicted. Do you think you can live somewhere forever for free? The way it is properly done depends on some things, like if you are a tenant, or a sub-tenant; paying rent or not; if you are a week to week, a month to month, year to year tenant; if the eviction is for not paying rent or another reason.
A: Is the initial aggressor in a fight solely responsible?
Not always. Did you have an opportunity to retreat? Did you escalate the fight or continue when it could have been ended? In Florida, we have the stand your ground rule, a no duty to retreat law, but that will not always help. Who is the aggressor is a fact question. Sometimes those facts do not get sorted out until a jury decides.
Is a person acting in self-defense also subject to arrest?
Fighting is actually against the law. It is called "affray" and if it appears that persons are fighting by choice, it is a minor crime. Assuming you were voluntarily fighting and the other person "started it" you might not be charged, or if charged, you might get the charges dropped, or win an acquittal. The end result depends on what evidence the prosecution is depending on. Is this evidence sometimes undependable? That's a big yes. Does anybody care? Your lawyer is about the only one besides you who will care.
Go see a local lawyer in person. Take your paperwork from the arrest. Be prepared to pay the lawyer. It could be the best money you ever spent. Many employers do not hire people who have fighting or violence on their record. A lawyer might be able to keep your record clean, depending on your history of arrests. Good luck.
A: You write too well for a person who is apparently clueless about how releases work. If you sign a release, you give up all future rights. I do not know if your herniated and bulging discs were caused by the rear end accident or if you are a professional wrestler with pre-existing or post accident injuries. A $10,000 settlement is not much settlement for all that injury.
Maybe there is more insurance or other assets available. A professional would check on it. Do not trust insurance adjusters.
Do you have a UM policy? Were you a passenger in someone else's car, or was it your car? There are dozens of questions that a professional would ask. Thereafter, you would have good information. Get a lawyer, or at least consult with one for an hour or so to get the right information.