(1) If it is the first time to go, it is necessary. You can bring anything in the future.

(2) If it is the first time to go, it is necessary, but relatives will also give you hundreds of red envelopes.

(3) Not clear.

(4) It's nothing special to invite people to drink, is it? Almost anywhere. The guest who pours wine will give you a red envelope, which is called "human favor", but you have to give some back to others. Both, some and some don't.

Note: I am only 18 years old, never married, and I don't know anything, but I have lived in Shaodong for 18 years, and I still know something.

Your wife is Shao Dong's, too. He knows it clearly. You can remove a part for her parents first, and then ask her parents how to give it to relatives.