hi! just bought a new imac 20, this is my first mac, had gateways forever with no real complaints.(on it now), id like to start off with, what do i need to do to to get up and running? whats the first things i need to do when i hook it up? is this imac a true plug and play? there will be 4 of us useing the imac (family), so can everyone have their own account?i will start off with a administrator first i guess. thanks for you feedback, sure i will have plenty of ??'s...