I don't know if home-cooked and raw are different in how much to give, but with a raw diet for dogs, you give 2-3% of their body weight per day. Given the size of your dog (being a large dog), it'd be spread over two meals per day. If the dog is on the underweight side, increase it to 4% until the dog has reached a regular weight, then go down to 2-3% for maintenance. If the dog is overweight, reduce the amount slightly, starting at 2%, or 1.5%, until a desired weight has been reached.
Treats are included in this percentage, so keep those in mind.
Good luck in finding a diet that works for your sweetie!