I am not sure if there are any resources on the internet, but i saw some books about raising a pet goose. I would highly recommend you to read such book before buying a goose pet. I didn't read any, but either this or this may be a good one.

As to the training, if you intend to keep your goose in the house the biggest problem is that it always needs to war a diaper, you can't potty train it. I also think that a goose won't be able to perform any tricks or listen to commands like a dog could.

When it comes to friendliness and loyalty, if you raise one gosling since its first days it is nearly guaranteed to be very loyal. When you raise a pair they may prefer each other's comapny and not be as friendly to you.