I'm a beginner with geese. We bought a pair of rare breed Shetland geese last year, from a specialist breeder, and they've just presented us with 9 goslings. The goose hatched and reared them without trouble, and so far all is well.
However, the gander does like a good hiss and will come at you with flapping wings. I just fllap and hiss back and off he goes. He did once erupt from the shed just about into my face, and proceeded to peck my knee and swing off my trouser leg

. Because of that, I wouldn't want geese around children, as they could do serious damage with beak and wings. Definitely choose a calm gentle breed (no idea what that would be).
My dogs are terrified of the geese, but the hens are absolutely fine (they were there first)
Having said all that, I love having my geese.
See my thread 'goslings' for some pics.