The address where you are now is the address to write, unless instructed otherwise by consular officials.

Name changes after marriage are recognized and permissible. You may change your name at any SS agency office with supporting documents. The SS...

See for details and qualifications: https://www.uscis.gov/CHNV Good luck.

"Supplemental Information" as what? More information is required.

The IRS makes that decision. Furthermore, the function of USCIS is not to regulate the paying of taxes.

There is nothing you can do at this time.

Not unless your LPR spouse naturalizes

The rule is not complicated. All documents submitted to USCIS in foreign languages, must be accompanied by English translations. You will be RFEd...

Applications can proceed in parallel; they are not in practice conflicting. The may better be seen as complementary. In general, Cuba, Haiti and...

No. You are not a victim of crime and not qualified for U visa, if that's the question.