I've been doing this successfully for more years than most computer geeks out there have been house broken, if they are house broken.
When I decided to take up farming, I did the same thing. This is a sort of agriculture 101, with no single instructor. Now that the process has started, I know for sure I'll pay the tuition. I hope I'll also learn the lesson, but that is less sure.
The very first beasties on the place were 26 chickens. Well at least potential chickens. Peeps about 3 weeks old. I built some pens, the style called "tractors", and became, if not a farmer, at least someone responsible for the welfare of a group of critters.

Road Island Reds and New Hampshire Reds, about 4 weeks old
This group is down to 22, it seems the local raccoons like chicken too. Three of them woke up headless a few days after they got here. I did not witness the deed, but I have books that suggest this indicates raccoons.
One more met its fate at about 10 weeks old as breakfast for a hawk. I thought the birds were too big to be prey for the hawks we sometimes see around, but I was wrong. They no longer get to run around inside the fence, they stay in the pen.
These birds were hatched about the first of June. The goal is to get them into egg production.

Road Island Reds and New Hampshire Reds, about 12 weeks old
There are about four cockerels (males) in the bunch that do not qualify for that job description, so they are scheduled to meet their fate this weekend. The farms first harvest, yummy.

One of the "spare" roosters, next weeks dinner
We also started some broilers, a breed of chicken designed to eat, gain weight, and get eaten. The order of 50 arrived by mail (true, that's how they come) on August 4.

Cornish Cross peeps day 1
It is amazing how quickly these birds grow.

Cornish Cross peeps 1 week old
These birds are now about three weeks old and are on the pasture in a hoop pen. Not nearly as cute, much, much, much bigger.


Cornish Cross 3 weeks old
The pens I'm using for all these birds have no floors. I move them every day, just one length of the pen, to clean ground. This eliminates the need to clean out the pens, and give the birds a cleaner place to hang out, along with a dietary supplement of green grass and the occasional bug.