They're really easy, and really messy.
We start them off on chick crumb right away (unmedicated, since they're waterfowl). We just keep them in a shed, contained within a brooder ring, with a heat pad and a cat bowl of water. After a week or two the brooder ring gets removed and we open the pop hole to outside, which gives them access to a small run when the weather is nice. You'll be amazed how much grass they eat, and how quickly. Having the outside access also stops them from getting bored and munching the down from their friends' backs.
You'll find they'll imprint on you very easily, and whilst that's impossibly cute, do think long term whether you really want full grown geese thinking you're their mother. Luckily our first lot imprinted on my wellies and not me, so all that was required to break the cycle before it became a problem was a change of footwear!
My favourite part is the fact they're very obviously geese from their behaviour right from day one. Bear in mind that unless there's a colour difference etc in your breed, you can sex them at day old (videos on youtube for vent sexing goslings) or 6 months, but it's almost impossible in between.
Have fun!
"You act cute and distract him, and I'll nip round the back and steal his sandwiches...."
"I am Gandalf, future terroriser of cats, chickens and DHL delivery drivers. Got any duck crumb?"
"Must follow mummy wellie!!"