Just wait till you hatch chickens.. I am currently sitting next to my newly hatched ones, waiting for anymore to pop out of their eggs, so I can put them under a lamp.
I personally don't trust my silkie to sit there, but mine is a bit dumb. I have an incubator. They are quite pricey brand new, but if you can pick up a second hand one, they are fairly good.
You also have to have a rooster, that is active, and they have to be fertilised eggs.
I would wait a little while before you try and hatch any if your hens have only just started laying, as I highly doubt they are fertilised (though I am not an expert on this topic)