Good luck to you on your weight loss journey my friend. Though others who haven't walked in the shoes of a person morbidly obese, may say that surgery is the "easy way out", I'm hear to tell you that there isn't anything easy about this procedure at all. So the first tip I will give you is this, prepare to work your ass off, cause thinking that this is the magical cure all for your weight-loss blues is going to sourly disappoint you. You have got to prepare your mind and will power for this life changing procedure. Because its just that, life changing.
If you have an unhealthy relationship with food (i.e. using food as a cope mechanism, addict, emotional eater, etc) then I would highly suggest that you need to deal with those issues first before going under the knife. Get a very good support system in place to help you mentally deal with those things prior to the surgery. For me I had friends who had already had the surgery that I could lean on for advice, and I was seeing a therapist to deal with some of my emotional issues related to stress/food/and image issues.
Because once you get cut on and have 80% of your stomach removed, you won't be able to use food as a comfort release or coping mechanism as you may have done in the past. I learned that lesson the absolute hard way and I spent a good bit of my first year post surgery fixing and dealing with those mistakes that I made, because I wasn't as mentally ready for the surgery as previously thought. And experiencing dumping once or twice and needing IV fluids to be able to see, and comprehend again will make you follow the damn meal plans.< br />
Carbonation beverages I would just avoid, especially the first year or so. Now you will have a lot of people here that say never do it and some say its alright, I leave that up to you for you are an adult and can make your own decisions on that. For me I do rarely consume carbonated beverages (maybe a soda or hard cider ever 2 to 4 months at most), but I mostly find comfort in drinking flavored water, tea, coffee, and juice. I use to be about a 1.5/2liter a day diet Pepsi drinker and now I may have a can every 6 to 8 weeks at most and usually when I am out.
I haven't really had a beer in like almost two years but I have consumed hard alcohol like Tequila, Rum, Bourbon, and Whiskey. Alcohol is very different for me now in that I don't need no where near as much as I did pre-surgery to get a buzz. So because of that and the fact that I don't like the "buzzed/drunk" feeling I limit the amount of alcohol I consume too. If I am out socially I usually have one to two drinks at most and I sip them slowly throughout the evening to minimize the affects that the alcohol will have on me. As the farther out from surgery I have gone, my tolerance has slowly increased, but its nowhere near where it was at per-surgery. Again not a bad thing because alcohol, especially beer is empty calories, and gas which you will not need. Trust me on the gas part cause being bloated is an absolute pain in the gut literally.
I say all of that in the regards that you don't need the stuff really. Those first 12 to 24 months you should honestly be focused on eating properly and getting into a good workout/exercise routine so that you can continue to post gains(weight loss) while your VGS is still in its magical weight-loss phase. Cause eventually you will hit the stall and the tool will at some point stop being so magical. Get into good habits and work your ass off literally and you will see the difference.
Yes it will change. If you had low stamina and energy, it will increase. I mean you will have a lot less weight and body mass to deal with, so there is that bonus too. Also men tend to store testosterone in their fat cells, so the more fat you burn off the more testosterone you will be releasing into your blood stream. This means more Hair growth, stronger erections, huge sexual desires, and if you hit the gym a lot some more strength. Guys with erectile issues may see those issues go away when they lose the weight off.
Also your confidence will start to grow the more the weight comes off. You will look and feel better in your clothes. If you have a lot of fat padding around your pelvic area that will shrink away, which can help in penis growth a bit. Less fat around the "Ram Rod of Justice" I say the better for both you, your ego, and his/her pleasure (for my bi/gay friends there don't wanna leave you all out).
I say all of this because I too was in your shoes almost three years ago. Hell if they would have told me about the sexual benefits, as well as me buying normal size clothes in normal stores I would have done the surgery years ago. Instead all I heard about or feared was the complications from the surgery, and all the foods I could no longer eat. Yeah sometimes I do miss being able to eat anything I wanted to eat, but I wouldn't go back to it at all. Because now I enjoy so so much more out of life than what is on my plate.