I am confused by your question. If your spouse is in Nepal, why would you have to file I-485, I-131 and I-765. You would just file I-130 and once it is approved; start the consular processing through NVC and then ultimately Embassay in Nepal. If you are US citizen already, you would not have to wait for the consular processing as the visa are always available. Otherwise you would wait for your case number to become current and then start the consular processing. The current wait time for spouse of US permanent resident is 2 years approximately.

I think you should put the place you went for interview or the city you lived in for the place you were admitted as US resident.

Part 2 and 3 is about you. So you would list your spouse and children in this section.

Q-20- print the form and write the name and addrrss in Nepali in black ink or use word document or other online software to get the name and addrrss in nepali and copy and paste it into the box.

Q-22: list your current spouse in 20 and put NA in 21.
Leave spouse 2 blank if this is your only marriage.