Yayy! I agree with everyone else-these chicks will need to be brooder babies. Your other hens will likely kill them. If you're super worried about integration, I would get a few more so that they'll have an easier integration and can stick together. I second the see but don't touch method, and will also add these points:
-Multiple food and water stations. Chickens fight over resources, and having multiple places for food and water, preferably out of sight from each other, is super helpful.
-Clutter in the run. You want things for birds to hide under, behind, on, etc-just no dead ends. Anything that breaks up the line of sight is great.
-'Panic room' method. Once your chicks can move outside, after a week or so of see but don't touch, you can add holes in the chicken wire barrier that are big enough for the chicks to get through but small enough that the hens can't fit. This will give chicks a safe space to be in.
Everyone was so willing the share their knowledge with you. This made my Saturday morning
