That is not a dispositive factor in anything relating to immigration.

You may apply for naturalization by filing N-400. At naturalization your name may be changed to the name of your choice. You may, but do not need...

The may apply to extend their stay on the United States on their existing visa. They may not apply for the visa itself.

It is impossible to guide your friend upon your disclosure. She needs to consult with an immigration attorney.

You are a nonimmigrant on a nonimmigrant visa, not an immigrant. You may form a business entity, own it, receive income from this ownership, BUT...

Tests are not required. Your birth certificate is enough. Good luck.

There is a difference between a K3 spousal visa and a marriage-based immigrant visa. If you received the immigrant visa, contact USCIS about...

Yes, you may travel within United States and its territories.

Have you case looked at by an immigration attorney. If you have a pending I-539 extension of stay application you may explore a possibility of...

If you are situated outside of the United States, you may work for a US based employer WITHOUT a "work permit."