Hi!
. Welcome to BYC!
build your coop to accommodate twice the amount of chickens you think you want now. Seriously. I have 4 coops now because I didn't do this.
There are a lot of predators in the woods, so free ranging will definitely mean you'll lose the occasional chicken. My neighbor free ranges in the woods here and he loses his entire flock every year. I like the tractor idea much better, but then I have a serious aversion to feeding my chickens to the wildlife.
And it seems that everyone loves chicken.
So smart of you to plan ahead like this.

Chicken math is real!I’d like 4, but I’m thinking about purchasing 6 chicks just in case.

There are a lot of predators in the woods, so free ranging will definitely mean you'll lose the occasional chicken. My neighbor free ranges in the woods here and he loses his entire flock every year. I like the tractor idea much better, but then I have a serious aversion to feeding my chickens to the wildlife.

So smart of you to plan ahead like this.