Yes you may provide financial support based on income.

What is your status that you are changing or extending?

Write to the service center processing your case based on your receipt.

You should immediately file the I751 and provide explanation of error.

Your question is unclear as a court date cannot be vacated.

You may file for her as soon as the divorce is finalized.

Yes as long as application was timely filed.

You can contact USCIS for the error in middle name.

Begin the fiance visa with the filing of Form I129F with certain requirements such as meeting within the last 2 years. She will get employment...

Yes likely he would be removed. Best to consult with an attorney for guidance.