Hi badger
800 calories but technically no carb limit if you stick within the allowed foods. Some do aim for less than 50g carbs and it does mean you can have a very small amount of 'bad' carbs if for example you're at an unavoidable meal!
Yes full fat Greek, and yes cheese- but small amounts. A 1cm thick slice of cheese is about 100/150 calories. Fat keeps you satisfied and feeling fuller, but dairy also has carbs so tread carefully.
Basically eat meat, cheese, eggs, some full fat dairy, a few berries or apples, avocados, nuts, beans, legumes, leafy greens and other veg and salad.
Avoid potatoes, rice, pasta, breakfast cereals, bread, corn, and sugar.
Any questions, please ask!
I'm off out tonight with old friends, but have had a few very reasonable days.