My son also has cf and celiac. He also has autism. It is hard. We just got a feeding tube because he also can't have milk, dairy, soy or rice on top of wheat and gluten. All meat is fine, as long as you don't add gluten to it. All fruits and veggies are good too. There are gluten free butters out there.baked potatoes are great, they make pastas. Bread, crackers, cookies,ect. Are available but they are expensive. Reading labels can be overwhelming at first and you will mourn things you can't have, but you will feel better.
Most labels now say if an item is gluten free which is nice because when I started this diet with my son 9 years ago, you had to read everything.
You can find most items you are looking for, but try them first something's arn't to tasty. Eating out can be tricky too. Fast food is pretty much out because of ingredients and cross contamination. Like for instance if the fries are gluten free but fried in the same oil as the chicken nuggets, they are not gluten free, they are contaminated.
I think since you only have to stay away from gluten, you will be able to work out a high calorie diet for yourself, but expect the prices to be much higher than regular flood. Example would be a loaf of bread for my son that only has 12 slices costs $5.99 compared to $1 or 1.50 for regular bread.
It is a big adjustment but before you know it, it just becomes habit. Good luck. Feal free to ask any questions. Jshet