You have some very excellent suggestions regarding bedding for your new chicks. Now, may I make a suggestion regarding the brooder?
I'm now on my fourth batch of baby chicks, and at first, I had the brooder (a cardboard appliance box) on the floor. My chicks never warmed up to me, and were actually more scared of me as time went by. Every time I'd reach in the pick them up, they'd run screeching from me. Those are now grown up, and they are still impossible to catch.
Then this year, I got the bright idea to put the brooder up on a table, and I cut an access door into the side. It makes all the difference in the world, and it sure does save the back,too! The chicks see all of me as I reach in to handle them, not just a big pair of scary hands diving at them from above, as a predator would.
They never were afraid of me, and now that they're two months old, they're a cinch to catch since none of them run away from me.
I took it a step further. I wanted tame, TAME chickens! So I instituted a policy of daily lap holding. They all loved being held, cuddled, and they still do. My current batch is just a week old, and they're well on their way to being tamed already. Instead of racing away when I reach into the brooder, they stand there almost anxious to be picked up!
I wish you loads of luck with the new babies! Raising baby chicks is about the best thing in the world!