I have work sponsored green card and I and my spouse are not US citizen. If I want divorce would US law be applicable.

If your state court assumes jurisdiction the state laws would apply. Jurisdiction often depends on length of residence in the state and the place...

What kind of information and payments i need to send for my husband?

What's your status? How did your husband enter US? When? Is he here in US? Have you filed income taxes for the past 3 years? It is obvious you...

No unless he is issued a B-2 visa which depends on when and for what he was deported as well as other factors.

I have a citizenship, and I wanna immigrate my dad, my sister, my step sister, my step mom and my brother in law come to USA

Your question is based on a multitude of very wrong presumptions. Time to see a good lawyer.

Pending on 485, question about EAD

You will get more meaningful answers if you tell on what basis I-485 was filed. Generally, EAD allows you to work anywhere with I-485 pending.

depending on the circumstances of the case one cannot rule out the possibility that the US authorities will notify the Australian authorities of...

Do I need to file my I-485 within 180 days since the expiration of my authorization to stay?

You will be forgiven for overstaying as the beneficiary of a US spouse's petition.

Filed I 485 on Feb, did bio metrics on March still the case is on the initial review. Tried contacting USCIS offices Frustrated

You are not outside the normal waiting period which, by the way, has become longer of late.

Joint sponsorship?

If what you say is true and your family consists of you and your wife then they are wrong. Hire a lawyer to fight them over this.

No effect whatsoever.