What do I do to apply for U-Visa

You should consult with an attorney for a review of the crime you were a victim of. Good luck.

AOS generally takes 6-9 months depending on the service center. Yes you can apply for AP while applying for AOS and provide the reason for your...

Address and employment on I-129F: a reason for an RFE if info provided is less than 5 years?

The information you provided does not appear to be a grounds for a request for evidence but for a thorough review, it is best to speak and work...

I am preparing I130 for my married brother, I have questions at part4 59a

That part references “if filing as married.” You are not applying for your brother as a spouse but as a sibling, so would disregard that question....

Does immigration consider ADD, "attention deficit disorder" an issue, if I have papers, saying I have that ???

You can present evidence of this diagnosis with either a request for accommodations of the naturalization exam or an exemption from certain parts....

No you should have the appointment notice in hand when attending your appointment.

Does the denial for ina 212(a)(6)(c)(i) affect the immigrant visa of family reunification?

Yes it will impact a future immigrant visa.

Is there a case against USCIS for the situation below?

No this is not a case against USCIS as they can request evidence they deem necessary to make a determination.

RFE DOCUMENT?

Yes you should provide screenshot of conversations as well as translations where necessary.

Can I return to the US?

Yes your USC father may possibly petition for you, assuming there are no grounds of inadmissibility.