Sure, you may print the notice and attend the appointment.

The affidavit is valid on its face. Inadvertent little errors do not matter.

Assume nothing. You are definitely no in the backlog yet. Your interview may happen in a months or in 10 years, no way of knowing. Hire an...

It is necessary to examine the letter of denial and the legal brief submitted ( presumably) by your expert attorney to give you guidance....

No, if you infiltrate through thecbirfer, you may NOT get a green card through marriage. Look up 8 USC 1325 Improper Entry - federal crime.

You shall file I-130 for him. Preferably online. If he is still in status he possibly may file I-485 green card application and I-765 work permit...

Employment is irrelevant to naturalization.

Duplicate accounts with USCIS result in confusion and delays. Hire an immigration lawyer to proceed with the necessary filing ON PAPER.

All appears to be on the way to approval. The most difficult part - I-130 - is already approved. Be patient.

You may file I-485 green card application now.