Law / Polish Passport and Polish Citizenship (dual with American) [14]

What paperwork would I need? I have his death certificate and I already sent a request for his birth certificate. Is there anything important I need?

Law / Polish Passport and Polish Citizenship (dual with American) [14]

What would be the benefits of having both passports? I want it for personal reasons. I want to be able to go to Poland and stay longer than 90 days if I have to. Go to university as polish citizen and not U.S. when I go to Warsaw.