Check AILA.ORG for names of lawyers practicing where your case is located.

If you are doing this to one apartment that you got intending to live there, probably no problem. If you are doing this to multiple apartments to...

If you cannot show you are in status, there is no way to proceed. You probably have some document showing that you were in H4 status before you...

Yes, they can do that. There can be any number of reasons why they would do it, and it would be wild speculation to try to guess.

You can return to the U.S. any time before the visa expires.

It's after you get your green card. Not after you arrive in the U.S. or after you get married.

I don't understand your question. Provide the name of the employer, and the place where you are working.

Yes, it is normal for USCIS to have that message on one's application.

Without seeing the revocation it is impossible to give you any advice.

No, the extension applies to pending applications for extension of employment authorization.