Best to consult with an attorney for review of your history including employment prospects.

Best to have an attorney review your file for better guidance.

You can attempt to do so but will be difficult given pending green card case.

Write to the location where the ceremony was originally scheduled.

Bring the medical at time of interview and closer to scheduling.

No a medical exam is not required for naturalization.

Yes your mother may petition for you through filing I130 but you will need a waiver based on information provided. Consult with an attorney for...

Yes but once the petition is current, you can notify NVC.

This does not indicate anything. Be patient and wait for decision.

Yes you may do so after you marry. Consult with an attorney for guidance.