You should just do your best and complete the form to the best of your memory.

File one visa petition for your sister. It includes her dependents.

There is no rule against it. Yes, of course you will have to disprove the reasonable inference that you are an intending immigrant.

The short answer to your question is no. Unlike the TN, to get an h1b you need an employer to file for you.

One can apply for VAWA, if otherwise eligible, even if they have a pending asylum application, and even if they entered the U.S. illegally.

If you have a fraud finding, the consular officer can either recommend a waiver or deny the visa. If the visa is denied, that does not create any...

Once you are a permanent resident, you are no longer an F1 student. It would be a good idea to remain an F1 student until you get your green card.

There is no such status as H4 EAD. But regardless, you can always change from H1b to H4 if your spouse is an H1b.

She should get the form reopened and add it, or risk a finding a fraud.

There's no harm trying. Ask for it!