zorro, please look at special thread on ЭТО
http://masterrussian.net/f15/%D1%8D%D1%82%D0%BE-19593/

[нАгод] и [нагоОд] are both good. First is as many people say, but I don't think there is some strict rule.

My try:
When will you leave? The sooner the better!
Поскорее бы вы уже ушли!