what are the major and supporting documents we should bring?

Im kristel, my step father is working in macau he invited me to visit there (tour) with our one family friend. He send us invitation letter declaring all our expenses will be shouldered by him. We booked a ticket going there on july 18 - aug 17 (29) days. I've been there before when i was 18 29 days too with my family. My question is what are the major and supporting documents we should bring when were going to airport on july 18? So that we can prepare it when immigration staff will interview us. Please give me some advise thank you and more powers!