You need a run. Now if you have a run, you can still let them out to free range. The more you let them out, the farther they will roam. As you have all chicks, you have no birds with any experience. Experience comes expensive as in predators love inexperienced chicks by themselves.
I have a coop/ run...fort knox. (!#$^!$% coons) However I do let mine out of that set up to free range, but I do not let them out on the same time each day. Predators are quick to capitalize on routines.
I don't let mine out if:
- cloudy or high wind days - gives too much advantage to predators
- on a daily schedule - sometimes all day, sometimes part of a day, somedays not at all
- if I get hit by a predator, I do not let them out for several days, so the predator moves on, as they will be back.
- if we are gone for a couple of days, mine stay in lock down.
You do not have a multi-generational flock. Eventually you will, and that will help, the older birds will teach the younger birds. A good adult, more than a year old rooster can also help with daytime predation, not all roosters are good roosters, and roosters IMO take some experience.
Good luck, but build the run.
Mrs K