Well I'm from the "night shift", and I say good luck to you miss skippy. : )
As Daffy says, you'll need to eat good wholesome food after the op, but you won't be eating anywhere near as much as you used to, because your "new" stomach won't allow it.
I DO know someone who's had it done, and it'll take several months for the weight to come off, but it'll all be worth it in the end.
Losing weight isn't the easiest of things for some people, and I think you've made a decision that'll be life changing. All the best.