Would I have to serve the full 8 months? Or Is it possible to serve less time?? On Good Time Credit? Or any other way?

You can do upto 4 months but likely less.

What can i do ????????

So you were arrested two separate times but no charges were filed on the date(s) of arraignment? Have they been filed since?

Carpool violation and arraignment?

Look closely on the citation if he wrote "warned" of carpool violation.

What charges can be pressed on him hes a minor how long will he stay in the juvenile hall ?

He can be charged with assault with a deadly weapon and possibly other charges. Hire a criminal defense attorney that handles juvenile cases.

A stay of execution would imply the court held of on imposing a sentence or fine, etc. No need to worry since your case has been dismissed

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What is the nature of this crime, and what can I do about it?

Contact the police immediately. How old are you? Under 18?

Will I need to go back to court to get off informal probation if successfully completing the 3 year term?

You will automatically fulfill your requirement at the 3 year mark (unless you have violations that caused your probation to become revoked). You...

What's the process he will be going through

He will be taken to court to have the warrant recalled. He will no longer need a parent in court since he is an adult. What happens afterwards...

Do I still have to pay that given it was Juvenile charges?

Victim restitution needs to be paid.

Consult with a local attorney to see if you were properly served with the notice.