I have a friend I want to take hunting, would you start with ducks or geese?

It depends, I would say try both first and see which they like better!

I would say it depends on which one you are best equipt to have success hunting. Especially if they are young I think it is important for them to have some success to really spark an interest in it. If you are set up for field hunting and know of a great spot then I would say go for the Goose but if you have a slough full of Mallards then I would go that route.