A lot of people use glass infrared heat lamps throughout brooding. I did the same years ago. I now make sure the chicks have a dark period after the first 3 days. I keep the light on the first days so they can get food and water 24 hrs. a day.
For heat, I use ceramic heat emitters. They're a...
Maybe a mirror, feather duster, a tender leaf of clover, lettuce, carrot top, etc.. Or a small piece of fruit. It isn't necessary to give anything other than starter feed at this point and the things I mentioned are just to give them something to do. If they were outside with a hen, they'd be...
Pecking is normal but sometimes more frequent if the space is too small and they get bored. Give them some things to walk around and peck at.
For the first few days, I keep them on paper towels and sprinkle the feed and chick grit on the paper towels. Grit isn't essential if only giving starter...