Immigration?

Form N-600 is probably the best way to go.

Delay in processing AOS

First of all, the NVC doesn't process AOS cases ... that office only processes Consular IV cases. Secondly, if the NVC is involved, there must...

Can admitting that you are an undocumented immigrant in any court be grounds for deportation?

Your question is too generic. What do you mean by 'any' court?

You should hire an attorney and ... perhaps your uncle can help.

How can I leave the US immediately? Please HELP!

Your country's Consulate should be able to provide you with a one-way travel document.

No, unfortunately you can not 'transfer' visa petitions between siblings.

If she stayed in the US after you left ... her H-4 is invalid. Talk to an attorney in private via Skype.

Q: - Is the E2 still the right choice for someone like me? A: Yes, perhaps Q: - If I get an E2 for one business, can I be an owner and operator...

You are 'pushing' things and I do not recommend that you continue with your volunteer WORK ... paid, or unpaid, it is normally forbidden.

Yes, you can change 'firms' and go to another employer for the SAME JOB type/description.