If you are hatching them out you can put them in the brooder as they dry. When everyone is out of the bator, you could keep them indoors for a couple of days but they will grow stronger and feather out quicker the sooner they are exposed to their natural temperatures.
My broody took her chicks...
I have a built-in brooder in my coop with an attached covered outdoor run.
I put the chicks outside in that brooder using a brooder plate with a soft towel over it as I didn't have a heating pad without automatic shut off.
The chicks did great. The below picture was taken on a morning that was...