There may be stitches or just the tape that they use. I think they lean toward not using stitches for small incisions anymore. Just ask them what you should do, whether you can shower and how soon, etc.
I think I ate a bland diet for the next week or so. I wasn't hungry for a few days but made myself eat what I could. I also had constipation issues due to the pain medication (very common) which was painful due to the abdomen being sore, so you may want to be ready for this.
I think it took me about 2 weeks, but honestly, in a few days, I was feeling pretty decent. I think I felt worse from the CO2 they pump you with rather from the incision points. It helps to walk around alot and massage the shoulders (where the CO2 headed for me) to help with this. Your torso may be sore and they may advise you to use a "log roll" when getting up out of bed and use your hands more when you get up from sitting.
I think it took me 4-6 weeks more to regain my energy fully but I also have fibromyalgia and it can take longer to recuperate due to this.
As for my diet afterward, I went back to my high fat, low carb diet (Atkins) and haven't had any issues. I think for my first year, I avoided my trigger foods (pork, nuts) but I can now eat them without issues.
Hope everything goes well. Having mine out helped me tremendously and hope you find the same.