There is no easy and quick way to find out if charges will not be filed. You need to call the court and you definitely need to show to the court...

Define your definition of concern. Every misdemeanor charge is serious. You can schedule a consultation with an attorney.

It is hard to determine what uscis will do but if you they requested RFE and it is not what they wanted, USCIS can deny applications.

Yes you can as spouse of united states citizen.

Hay opciones pero depende de detalles de su caso. Hable con un abogado lo mas Pronto posible

It should not affect your visa petition.

Yes it can be revoked if it was obtained by fraud.

It should not affect your petition. You can always consult with an attorney more details of your casem

You can hire an attorney to do it on your behalf. You can do it by yourself by going to court but like colleague said there are risks.

Yes you can hire an attorney to help. You can update the application.