I would try not to over-think things. There are some real experts here, and some people who do way more than you need to. The important thing is to do the basics and be humane if anything does go wrong. Have the brooder set up and temperature-stable, be ready to have warm water to drink and food. If mail order, cover the shavings/straw with paper towels until the chicks learn food vs bedding. Be flexible with the temperature in case they throw off more body heat than you planned. And if you have small kids or other sensitive people, be aware there may be some DOA chicks no matter how timely the box arrives at the post office. Then if there are problems, by all means post here and the pros can answer it. Good luck!