US Immigration from Ghana

I've done a bit of searching but can't seem to find all the info/have it confirmed:

My spouse and I have been stuck at NVC for over a year- we were DQ'd in May 2020. I (petitioner) have moved addresses in the US and I'm trying to figure out how to make sure everything is changed over adequately. These are the two pieces of information I found:

1. For USCIS: I have to mail in the I-865 form to USCIS. There's no way to do this online?

2. For NVC: I have to fill out the public inquiry form with my new address.

Does this sound correct? Am I missing anything? I want to make sure I'm not missing any steps! Thanks in advance!

The NOA 2 is valid for 4 months, so once it expires , what needs to be done ? Do we write to the embassy or NVC to ask for extension? Thanks

I have a long term B1/B2 visa issued in Ghana by the US consulate. I have used the visa a cuple of times for visits to the US for work related actvity and visit friends. I am intending to tie the knot with my girlfriend (US resident) in December 2022. My current B1/B2 would still be valid by then. I need advice if I can enter the US ith my B1/B2 visa for our marraige ceremony or should I apply seperatelyf or a K1 visa for this purpose? I intend to move to the USA after our marriage and looking for the best scenario to ease the whole process of moving ahead. Thank you!

Western Union gave me a money order for $500 and one for $180. Has anyone had to do this and did USCIS accept your $680 fee this way?

My husband went to his interview on June 23rd and was told the case was approved however because he forgot our marriage license as well as the medical report hadn't been received they put the case in refused status pending additional documentation. My husband sent the marriage license via DHL as well as confirmed receipt of the license as well as the medical report.

Our status recently went from "Refused" to "Ready" with verbiage about scheduling an interview.

What does that mean? He already went through the interview.