Cut carbs to the bone...it will help later. Focus on protein/fat/ and hydration and getting as healthy as possible now.
If you need an idea of what you can eat
Any beef/pork/seafood/poultry
Dairy products (but take into account the carbs in them and yes, there is sugar in milk, it's called LACTOSE and is part of the milk)
Fats....do not buy into the low fat nonsense...all low fat does is add sugar or sugar alcohols to make it taste better. Example, Twizzlers are pure sugar BUT they say LOW FAT on the bag! Well, duh...just because they are low fat does not make it good for you.
Spend the time getting rid of any soda/sweet drink habit. Soda is not a no forever BUT as a newbie, it can be hard on a HEALING system.
Coffee is also not off the table but to help with any caffeine withdrawal, add decaf now...and slowly switch to nothing but decaf before surgery. You can go back to caffeine afterwards.
As to everything else, READ everything here and at DSFacts. Print out anything you need and place in a binder for later. Most of us suffer from anesthesia brain in the weeks following our surgery and ask for the same info we already read. An idea for organization is here:
http://bariatricfacts.org/threads/we-have-to-get-organized.2488/
Vitamins...Not sure who your surgeon is but if it's Boyce/Williams in Knoxville, do NOT buy theirs. See the lists of vitalady links in the Vitamin/Labs forum.