Contact NVC directly through their online portal.

You may file a waiver if eligible. Consult with an attorney to review options.

Best to discuss with a local criminal defense attorney. Good luck.

No it does not appear you are eligible unfortunately.

The mother will sign on behalf of the minor.

Yes it means that the case was accepted.

The government wishes to see previous stays and possible unlawful presence.

If based on fraud, may impact immigration. Consult with an attorney for guidance.

Yes you may file them together by paper mail.

No this is not required for the petition.