Ah. I'm not terribly concerned about organic—we'll go that route if possible but it is not Absolutely Necessary.
Sorry, you raise them outdoors? In the run, I'm guessing?
We have a wee (expandable to old dog crate) brooding area in our coop which is where we'll have to raise our chicks (our carriage house is small, plus we have two feline overlords). Building the run has not yet started, though as I wrote earlier, I'm happy to bring in clumps of dirt and/or grass for the chicks after we've had them for a couple of weeks. The neighbors 3/4 mile down the road have chickens but they're the nearest I've seen...and our property was very thick woods & brush until 3.5 years ago.
I'm getting so excited...and nervous. LOL We'll survive! (I hope)
You'll do fine. It's scariest when you get your first batch of babies, and the chicks look so tiny and delicate that you wonder how they can survive anything... then fast forward a few years and you end up like me, thinking nothing of putting 2 day old chicks in an outdoor brooder while it's raining.
While my coop is a decent size I don't have a brooding area set inside so yes I raise mine out in the run.
Having just the coop to start is just fine, the chicks won't need run access for the first few weeks. Helps home them to the coop too.