Left alone, the birds will likely hatch sufficient numbers of chicks for your purposes. I've seen chickens, I've seen ducks, and I've seen turkeys used. The most common fowl used is probably chickens. With chickens, bantams and games are probably the most broody. When I've used bantams, silkies have performed extraordinarily well.
Cochins are also very broody and commonly used.
Games are as broody and can cover more eggs, but they are more high-strung and less conducive to handling such as when changing or candling eggs. I have found that if dealt with diplomatically, a hen can be used for several consecutive settings. What I mean by this is that if the chicks are removed very shortly after hatch and a new setting of eggs placed before the hen comes off the nest, the hen will immediately resume her set mentality and remain on the nest. Some have defined this as cruel and abusive to the hen, but I would agree with them only if the hen were deprived of food and water. By having food and water close to the nest, the hen will leave it every day to obtain sustenance and will not die on the nest as I have heard some say.