If he's not making the payments as required by court order, file a petition for citation of contempt against him.

Is it illegal for someone to drive away if they’re unsure of whether or not they hit your vehicle?

In Georgia there is a duty to stop, but based on your question, this incident occurred in Virginia, so you would need to repost your question there.

How long can they keep someone in jail and not be indicted ?

Has he applied for a public defender yet? That part is key. And to answer your question, at the 90 day mark with an indictment, an accused is...

Can I go to jail for not completing community service?

It's possible, but since all you owe is 3 hours, you likely will be granted additional time to complete those last few hours.

Can I sue Cobb County Government for charging me for parking when I was employed there?

Absolutely not. You had other modes of transport. You opted to drive your own vehicle and pay to park same.

I WAS TICKET FOR FIGHTING BUT WHEN I WENT TO COURT MY COURT DAY WAS MOVE TO ANOTHER DAY SO THEY GAVE ME A COPY OF MY TICKET ?

Yes, a change such as the one you described is permissible.

What if my landlord allows me to pay for another month after having a writ of possession...?

Her old writ is now worthless to her. She has accepted funds since obtaining the aforementioned writ. Hopefully you got a DATED receipt when you paid.

Can I get a 2 misdemeanors expunged from my criminal record?

If you entered a plea of guilty or were found guilty at trial, no.

What do I do in the case regarding no knowledge of the move over law.

Ignorance of the law is not a defense. Sorry.

Why was I charged with misdemeanor obstruction GA code 16-10-24 ?

You were charged because you allegedly committed the crime. You have defenses. That's what the trial is for, to work through the evidence. Lawyer-up.