Broodiness is in the hands of the Gods. You can encourage it, but you have to have a lot of things lined up: enough day-light, breeds of hens that are known to go broody, actively laying hen of that breed. Then you cross your fingers and try leaving either a pile of eggs in a nest or fake eggs or golf balls in a nest. Sometimes a pile of eggs will trigger it, sometimes not.
If you get one that is on the nest at dark, good sign. Act like you don't notice her. Hope hard. For me this is the hardest part, leave her be for several days. In my experience, often times, they act a bit broody, then they don't act broody, then they do, don't, then they get serious. If you set eggs too soon, you loose the clutch as they are trying to make up their mind. Been there done that.
As stated above: you really can't make a bird go broody, just kind of encourage it. Many a bird has only hatched 1-3 chicks. You do need to plan what you will do with the cockerels, usually more than 50% of the eggs are cockerels. And a lot of eggs will not make it to a live chick. Once on the old board, they did an ongoing count, and it was pretty much about 50% of eggs set, either broody or incubator, did not make live chicks. And half of those that do, will be male.
Good luck. Thought I had a broody 2 weeks ago, but she has not been back. dang it.
Mrs K