You would need to manage them just like you do with layer chicks. Start them on starter. They'll need to be brooded until they're fully feathered. If I was raising meat birds, I'd switch the whole flock over to multi-flock 20% protein, or grower. When the meat birds are big enough that they can safely free range, you'll need to supervise until you're sure that the bigs won't hurt them. There's safety in numbers, so your bigs will probably make a half concerted effort to put them in their place, then give up. Where will you be housing them after the brooder? You'll definitely have to figure out housing before you get them. What kind are you getting? CXR, or RANGERS, DIXIE RAINBOWS alias PIONEERS? If you get CXR, they'll be butchered before you have to deal with rooster drama. If you get any of the other breeds, you're going to have cockrel war-fare on your hands. Definitely read up on how to manage CXR. They DO require special feed protocols to avoid the many issues they are prone to.