For example, in Guangdong, on the wedding day, the bride must serve tea to her elders with both hands, and then serve tea to other friends. This is called "daughter-in-law tea". Those who have drunk "daughter-in-law tea" must give the bride a red envelope (the amount is not limited, it is only symbolic).
Oh, you should get ready for the reception on the day when the wine is served. Find a few good friends or someone to welcome the guests (mainly to help you collect red envelopes) and register the books (for the guests to sign as a souvenir). That's about it.
Bless you.