We are starting a brooder this week as our coop gets built and are NEW to the chicken hobby. I've done some research but now I'm wondering what age to get some chicks and what the difference is between getting day old chicks and 3 week old chicks. We want to hand raise our chicks to be happy, friendly, and personable and will be handling them every day. The brooder is going to be in a 2.5'x2.5x1.5' high sturdy cardboard box if that makes a difference. I am just finding a LOT of 3 week old chicks and zero day old chicks on craigslist. Any advice would be awesome!