I always line my brooder with a couple of layers of paper towels for the first few days. The chicks aren't as confused by the bedding, trying to sample it and scratch in it. It also means I can put a small pile of crumbles right on top of the clean paper towels and tap on it with a finger, the way a mother hen would signal to her babies that food was there. The chicks always seem to get the message of that tap against the floor near the food. When the paper towel gets messy (probably once in the morning and again in the evening), I lay another layer over the top. Sometimes only the area right under the heat lamps needs freshening so you can only add new paper to that area. When the paper towels are several days thick the whole bunch can be rolled up and removed as one big roll and you can do it again or switch to shavings.