I think they figure most of the stuff out on their own, along with a little human guidance if you want them to do certain things. I never had chickens before and bought mine as chicks. To get them to figure out the coop was home I had to keep them in there a few days and nights, since they kept trying to sleep in the run underneath the coop at night. Then they started sleeping and staying in the coop all the time, so every morning I would have to pick them up and put them outside lol. But, they eventually figured it all out, and now go straight to the coop when it starts getting dark. I put golf balls in their nest boxes and that seemed to train them to lay eggs in the box and not on the floor (it took a little while for them to get that- was finding eggs on the coop floor for a little while). They are pretty good at picking up habits. My farmer friend says I have pet chickens because they are so tame and eat right out of my hand, and come running to the gate when I come home from work. They are pretty smart and will learn, at least from my limited experience so far with them. I think it took about a week or so to teach them the coop was home and to come inside at night, and then to go outside in the morning. Same thing with the egg laying in the nest box. So, I don't think you need any older chickens, but if you want them to do certain things you have to put a little effort into training them.