Sorry to hear about your little turkeys Ludi
Maybe a hawk carried them off? That's what usually happens around here if one just up and disappears. Hawks don't go for our full grown chickens, even the banties, but I have to carefully watch my babies and Junior chickens. We've had several carried off - a couple right in front of me
A chicken will, on average, lay an egg about every 24 hours. Some breeds are better about being on time. Some breeds will almost quit laying on you in the winter. If you're just
wanting eggs, then white leghorns are about the best choice. They're light breed birds, so they eat less and they're prolific egg producers. However, there are many dual purpose birds (both meat and eggs). Depends on what you want them for.
As for housing, you need to have about a foot of roost space per adult bird (more is better). If you're wanting a dozen eggs a week, you could get away with just three birds. If you get 4 eggs a week from each bird, that still gives you a dozen. When I started we bought four chickens. Now I have about 100.
Chickens are kinda addictive lol.
Oh, don't be surprised if, when you bring your birds home, they don't lay eggs for a while. Moving chickens upsets them. Sometimes it will be a week or two before they'll start laying. Sometimes a move will put them into a molt. If that happens, feed them crushed red peppers. It'll help bring them out of it faster. And always keep out free choice oyster shells to help with their calcium.
You're gonna love having chickens. Be sure to let us know how it goes