If you want a better environment and convenient shopping, I suggest you live in Causeway Bay instead of Mong Kok, where it is too noisy and the room conditions are generally poor. I stayed in a small hotel in Causeway Bay every time I went. The boss is good at doing business and is very nice. Moreover, he provided two computers in the living room for passengers to surf the Internet for free, and almost no one used them. If you bring a notebook, you can use their wireless LAN. If you don't have a password, you can download the movie at 1m/s, which is very cool. The hotel is at the Causeway Bay subway exit E, then turn left for 50M, then go to the crossroads and turn left for 80M without crossing the road. It's so close that the sect forgot that the subway exit is in the same building as that hotel. The hotels nearby are similar, so it shouldn't be difficult for you to find affordable, clean and convenient ones there. By the way, it's usually about 360 Hong Kong dollars, and Mong Kok is usually about 300 dollars. I said a family inn, not a hotel.
It is enough to bring a Hong Kong and Macao pass. Hong Kong doesn't care about your other documents.
The subway leaves in the early morning, which is very convenient. The most convenient thing in Hong Kong is the subway, and you can go to almost any popular place.