Hey, I have a couple of different ones, they are really REALLY easy to keep- I treat them like Crassulae, don't water too much in winter, make sure they're well drained and don't worry too much about light, I have them in north east and west windows, and keep a small jar of water in the middle of my kitchen(which gets almost no light at all) for rooting cuttings
As far as I know dealing with the offshoots is a matter of personal taste, I prefer to yank them off once they're big enough so as to maintain a single spiky plant (don't wait too long though, they can be incredibly stubborn if you let them go too much)
That should cover it, if anyone has any more info/observations on whether to leave the side/off shoots on or remove them, please add it as I am not too sure if it's just preference or if, down the road, one practice or the other could cause problems...