Keep them inside the coop/run for a week until they know where home is. Then they will put themselves to bed. They will not run away.
I do have concerns though if they are very young, say six weeks of age. They are very vulnerable to predators at that age (hawk bait) and need overhead netting if you have hawks, and a smaller area until they mature.
Free ranging does bring predator losses sometimes unfortunately. You will like having a run for them if you don't already- even a small one- in case you go on vacation and want to keep them safe.
I have to go for now. I will check back with the thread later and maybe give more advice!