Yes, there is definitely a learning curve, and different coops have different details that matter.
It sounds like you're on the right track (or at least, on one of many "right tracks," because there are probably many ways that would work.)
Maybe use wet chick starter as a treat. Most chickens like it very well, after the first few times they have it.
You can put chick starter and water in a dish, and call the chicks as you set the dish in their coop. You do not need to let them out to practice this at first, just call and they...