You might take a look at low FODMAP cookbooks or websites to get ideas for cooking without fermentable sugars, as those are likely to be the kinds of things that would make you gassy (to address your second bullet point). A lot of what @Cathyschuh recommended is in line with low FODMAP cooking. When I had stomach issues, avoiding high FODMAP foods helped a lot - rice, potatoes, and lean proteins were the mainstay of my diet for a while! I like Kate Scarlata's website, especially the fruit and vegetable coverage on her food checklists (https://www.katescarlata.com/lowfodmapdietchecklists), if you want more information about FODMAPs.