The US immigration law, regulations, and policies are silent on the regulation of driver's license. The various states and municipalities control...

Not necessarily, as you may file DS 260 and I-864 after I-130 approval.

You are unable to add case to your account for case tracking. You may track progress of case individually using receipt number.

Apparently, the marriage appears not to be in good standing after the grant of CR. From that perspective your I-751 may receive unfavorable review.

You are past the 3 years rule and should apply under the 5 years rule.

USCIS will review your I-864 and may request for additional documents if needed.

If you don't want to be responsible, then your spouse may not sign.

By not consulting an immigration lawyer you took a huge risk. You may be put in proceedings for deportation. Speak to an immigration attorney ASAP.

The consular officials will review your documents and respond to your submission. Good luck.

You need a new card while your N-400 is pending. Compete Form I-90 with filing fee,