Your roommate will have to take you to court to evict you. Posting a notice on your door is not enough

If you have it in writing you can sue her in small claims court

Give the parent a copy of the bill and and see if they will pay it, If not you can sue them if they will not pay .

there is a weapon involved such a gun but anything could be a weapon,

You need to retain al lawyer, It is more difficult to parole on an aggravated assault case

It depend on the charge . If the case is aggravated the answer is no,

A condition of bond will be you can't possess a firearm

Yes you need to return the detectives call .

He could end up in prison, he needs to hire a lawyer and not talk to the police,

The case has not been presented to the grand jury yet,