We've been keeping chickens for a few years now. The wife loves it as a hobby. Started with a rooster and a dozen hens. I converted a shed we previously used to keep outdoor sports gear into a coop. Added nesting boxes, roosting bars, created a couple of partitions inside, and added a doggy door that opens to an outside pen. Probably spent a few hundred bucks in posts, lumber, and fencing. We still have at least half of the original hens, and have since added via incubating the eggs or letting the hens sit on some of the eggs. Also raising some new chicks from TSC, now pullet sized. Current roster is 3 roosters, 15 or so hens, and we'll keep about 6 of the pullets. We also have 4 ducks. We're on some acreage, so the roosters crowing all day isn't too much of a problem. They are great at protecting the hens. Very watchful.
They free range during the day, and get locked up snug at night. Hawks can be a problem, and occasionally a racoon or other four legged predator. We have a Weimaraner who, considering she's a bird dog, has adapted very well to being a livestock guardian animal. She spends much of the day keeping an eye on the flock.
We get about a dozen chicken eggs a day, and average 2 to 3 duck eggs as well. We keep neighbors, friends and family supplied with free eggs (we don't sell them). We've talked about doing a charity/self-serve kiosk at the end of our driveway. Not sure we'll ever get to that point.
The duck eggs make the best egg salad I've ever had. The eggs in general are more flavorful than store bought eggs. Part of that is refrigeration (lack thereof). The yolks are a beautiful golden yellow, much brighter than the pale, store-bought eggs.
Up until recently, we've bought flock feed and cracked corn from TSC. We just made our first trip to a local farm supply place, and bought a 55 gallon drum full each of feed and cracked corn. By my calculation, that cuts the feed cost in half vs. the TSC bought stuff.
We till the coop cleanings (pine shavings and chicken poo) into our garden soil in the spring, and I've also used that mix to amend trouble spots on the lawn.