You can introduce the characteristics of each dish to him when ordering. It's best to tell him the ingredients and taste of each dish. If he insists that you choose, you can ask him about his tastes and dietary taboos, and then generously order some specialties of this restaurant. You don't have to choose expensive ones. That's not what foreigners care about

You don't need to help him do anything when eating. Just put what you want on the table and tell him the purpose. He will do it himself or ask you when you need it. But don't take the initiative to persuade wine and vegetables. These are impolite. Maybe you are enthusiastic, but they don't have this habit.

You can talk about some relaxing and interesting things appropriately, but it is not appropriate to talk about it enthusiastically when eating, which makes people forget to eat. You know, in the west, foreigners always sit in their seats when eating, and everyone enjoys himself, just eating, and rarely talking at the dinner table.

Nature is the best. Don't think the other person is a foreigner, take care of them everywhere and be careful everywhere. They don't usually think so much.