US Immigration from Iraq

I am a US citizen who has been living abroad. I got married in October of 2017 and I am currently working on my spouses IR1 visa. I don t have any tax transcripts to be included with my i864, as my wife doesn't have a social security number or an ITIN number. I am aware that my wife can obtain an ITIN number, but I looked at how much gross income I made during previous fiscal years whilst married and it didn t exceed the minimum filing threshold to file jointly, so I didn t apply for one. Would my joint sponsors i864 and his/her tax transcripts alone suffice if it exceeds the minimum requirements?

Hey guys, i have a few questions in reference to the i864 requirements for the IR1 visa, im the petitioner and im petitioning for my spouse.

Questions

1. If I submit a tax return transcript does a w2 form need to be included or is that only necessary if you submit a complete tax return?

2. Do I have to submit my last 3 years tax return transcripts or only my most recent? I have been unemployed for over a year and half.

3. How much does a Co-sponsor have to make in order to sponsor an immigrant?

I am in the process of trying to obtain an IR1 visa for my wife. I am currently in the NVC stage of the process. I have two questions with regards to this phase.
1. My wife does not fully comprehend English; may I assist her with filling the DS260?
2. I believe the NVC requests the petitioner s last 3 years tax returns (w 2 s, 1099 s and schedules). They also request petitioner s proof of employment. I am currently living abroad with my wife and have been for the past 4 years. I was working for a local company up until last year and I am currently unemployed. I do not have any tax returns. What should I do?