Chicks are hatched with most of their instincts. They know how to roost, scratch, peck, drink, eat, fly, etc. You don't have to teach them any of that, and you can't, given the fact you are a human and not a dam. One thing you do have to do is to dip their beak in food and water when you first get them into their new brooder; this is to tell them where they can find those resources.
Usually, people begin to integrate their chicks outside at six weeks.
They do not know what they can and cannot eat. The brooder babies mouth everything until way later than their broody raised counterparts. Like Perris said, trial and error