One doesn't simply adjust status, you need a basis for it (a company sponsoring an EB2 petition if the person is not from China or India works, or an EB1 petition works, marriage to a US Citizen, or if you've been a victim of a crime qualifying for a U-visa). If she does qualify to adjust, you may want to see this guide showing how the process is done from start to finish: http://westimmigration.com/h1b-sample-petition-walk-through/
As my colleagues have mentoned, yes it is possible but time is of the essence. Also, if you're looking into how to file check out this free do it yourself guide, i assume he is outside the US: http://westimmigration.com/i-130-relative-petitions-nvc-processing/
Should be fine, but there can be some complications due to them entering on the B2, but since their decision took place after admission, it should be ok. If you need some guidance on preparing the concurrent I-130/I-485, consult an attorney, but you can also check out this free do-it-yourself guide (again, the best choice is to hire an attorney): http://westimmigration.com/i-130-relative-petitions-i-485/
Indeed consult with an attorney to assess your case initially.
You may click the link below to find some useful free immigration lawyer-prepared self-assessment tools relating to your petition and adjustment of status as well, along with case prep kits and attorney review services at reduced rates.
Yes, you, as a contributing household member should fill out the I-864a and your wife, the I-864.
You may click the link below to find some useful free immigration lawyer-prepared self-assessment tools relating to I-130 and immigrant visa applications, as well as low-cost kits and attorney document review.
Must be nice to be a green card. Kidding aside, you can help her get a visitor visa. If you work, you can also take care of the I-134 form.
You may click the link below to find some useful free attorney-prepared self-assessment tools relating to B-2 visitor visas.
It seems you are somewhat unclear on who needs to prepare which forms.
You may click the link below to find some useful free attorney-prepared self-assessment tools relating to I-130 and I-485 petitions along with the other necessary forms (I-864, and optional I-765 and I-131).
Small tip... you can try bizben.com, and search for ready made businesses. If you purchase them, and the investment qualifies as "non-marginal" and the investment is "substantial." You should speak to an immigration attorney to assess whether the particular investment will qualify under the particular E-2 regulations.