We start ours indoors too, but in a brooder hubby made, and horse bedding pellets so no dust, no odors.We raise ours for the first three weeks in a big plastic tote in a spare bedroom. Dust is not a problem because we use puppy pee pads, not shaving or bedding. We change the pads every evening. We use a heat bulb in ceramic housing as @Debbie292d mentioned, and we suspend it from a rod in a closet from which we have removed the door. The tote is half in, half out of the closet so it has a warm area and a cooler area and the chicks can go to the area they prefer.
@azygous' suggestion is also a very good one, but we usually start our chicks very early in the spring when the weather is quite inclement and frankly ... I don't like the cold and wet and mess at all, at all, lol! Brrr!

We pull the towels after a few days.
