Ok, let me see what we have here starting at the top. There are white coturnix that are not A&M, but I'm not sure how you'd be able to tell the difference. You can't really judge by size since you don't know what they've been fed up until now. Going solely on the feathers, they're at least 3 weeks old and shouldn't need heat if they're in your house. Whites are a little more prone to aggression, so keep an eye out for your other birds missing neck feathers or damaged eyes. Look for a video on sexing them by checking for foam once they're a few weeks older. Look at the chests of the browns, males will begin to develop a burnt orange coloration just under the neck. You'll notice fewer speckles compared to the females. This begins at about the 3-4 week mark. Think about how a male robin looks vs a female; it's very similar in my opinion. You want a ~5:1 ratio of females to males, but keep 2 males just in case. Separate or eat the remaining males. Obviously, keep the biggest ones after weighing them in about 3 weeks. Once the eggs stop looking white or looking weird, incubate some. The ducks you'll just have to wait and see if they're boys or girls. I mean, you can try wrestling them upside down and manually checking, but I don't do that lol. The girl will quack and the boy will have a curled up tail feather. Those chickens can fly, so trim the wings. Just do one side, and do the opposite side next time. When the birds are adults, you can use the same layer feed for all of them, just buy crumbles over pellets. I doubt your daughter wants to eat the rabbit, so have fun with the new pet! Have her wear some decent gloves until it's pretty tame.