What etiquette do you need to worship your godmother in Shanghai and what is appropriate to send?
For more traditional godmothers, a simple ceremony can be held. On solemn occasions and occasions, such as traditional festivals in your home or her living room, you should knock your prospective godmother three times in front of witnesses, call "mom", then say something sweet and give a small gift (depending on your financial ability and age, it is not necessary to be too young). In response, the godmother should also have it.
For a godmother with modern ideas, there is no need to care too much. Just pick a suitable time, such as when she is happy, anywhere, on the table, in the hall, as long as it is not too indecent. You can call your mother directly when you worship your godmother, preferably in front of everyone.
As for what gifts to give, I personally think that if you have a job and have a certain financial ability, you can buy some gifts, and the gifts should not be too heavy unless you have some intention to worship your godmother. As for what the gift is, it depends on your dopted mother's preferences, decorations, cosmetics and so on, mainly depending on her preferences, and we can't help you.
If you are still a student, make yourself a small gift or buy a cheap but decent small gift, even if it is a painting you drew, a calligraphy you wrote, a card you made, etc. If you buy it, you can consider beautiful and generous trinkets, which can be brought without making others feel inconsistent with their status and economic ability.
If you are still a child, it might be nice to give your godmother a kiss, haha.
The above is my opinion, I hope it will be useful to you.