How big is the run? How many chickens? What are you going to put on your run floor?
I have the following in the run besides a forest floor:
1. A grit container
2. A container for crushed eggshells
3. Two tree branches for roosts
4. A suet feeder for treats and fun
5. A dust bath in a plastic tote, but I moved this out of the coop for more room and because they are still let out of the run during the day. And because they told me they wanted it somewhere else! haha.
The way they forage in my run is that I throw down veggies, fruit, and other treats and let them scratch for it. When the weather is warmer, they are out of the run in a fenced area with lots of bushes and trees for cover.
Have fun planning! The folks here are a lot of help!
And