Since you have a new SEVIS number, you will need a new visa sticker ... even if the old one in your passport hasn't expired.

I am on H1B visa changing to G4, does my wife has to change to g4? She has its own H1B since 2011. Different employer.

She can stay on H-1B if she wants. It is her personal choice.

How do I apply for my fiancé from India? She had unhcr card also and I’m citizenship of USA ?

You need to travel to India to meet her before you can file form I-129F to sponsor her.

Are you planning on traveling to India to prepare and submit the application. OR ... will you prepare the materials while you are in the US?

What happens if I don’t have the money to file for my green card after I got married ?

Find a low/no-cost non-profit: https://www.immigrationadvocates.org/nonprofit/legaldirectory/

What is my immigration status now? And by which USCIS's (or by another US government organization) document I have this status?

Your status is uncertain. If you fill in a form you can put "asylum application pending with Immigration Court"

What benefits I have? By which USCIS's (or by another US government organization) document I have these benefits?

What kind of benefits are you thinking/asking about.

Are you saying that he NEVER, ever, had a J in his entire life?

Can you adopt him? Yes Will it give him immigration benefits? No NOTE: You are confused about his B-2 visa. He gets an initial 6 months...

Threatening?

Not an immigration question I'll re classify it as criminal.