Homemade Chicken Broth

I'm making chicken broth from scratch. 2 chicken carcasses and lots of vegetables and herbs from my garden. Includes onions peels and all, celery, cabbage, zucchini, carrots, bell peppers, chives, thyme, sage leaves, spinach and salt and pepper. Cover all ingredients with water and cook in a roaster for 36 hours. I'll then strain and put in a large bowl to cool then place in the refrigerator for 24 more hours. I'll skim off the fat that floats to the top and reheat to pressure can. I'm a newbie homesteader and just trying to utilize all our goodies!