We submit I-864 with most recent tax return with W-2's, 1099, K-1's etc., current job letter and no pay stubs for family cases. If employment...

It is a multi-step process. First step is an I-130 with supporting documents. After approval the NVC will oversee the immigrant visa process...

I recommend sending a set of supporting documents with each form as they will be adjudicated at separate location.

Yes, this is doable provided the J-1 does not have a 2-year foreign residency requirement in which case 2 years home or a waiver are required...

The fee is $1225. YO do not need to complete the public charge requirements or file the I-864. If you can't afford the filing fee you can...

I would choose USA; if you are selected you can decide whether to go through the immigrant visa or adjustment process.

If she locates an employer willing to start the labor certification process for her, that woudl result in a green card.

Yes that is possible as long as a visa has not been cancelled.

The petitioner is supposed to have a good faith intent to domicile in the U.S.

Yes, you can do that provided the B-2 visa has not been cancelled.