Some things to think about.
An egg will hatch in 21 days.
Thanks, didnt know that
You definitely need to hatch in batches or they will not get along. You will want to do all your processing at the same time due to the setup and so forth.
I dont want to do all my processing at the same time, as i'm assuming some kind of scenario with minimal power to store (refrigerate) the meat. I would process individually on the day.
Two batches a year would be fine but you may think 3 or even 4 would be better.
How many can a chook do before they become strained?
Your talking roughly 100 birds.
Hatch extras because you will lose several for different reasons and it never hurts to give some away as long as you don't feed them too long (day old chicks maybe).
Winter is very hard on new chicks. Prepare for heating them usually.
Winter isnt that bad in my AO fortunately
What will you do with extra eggs?
Good question, and no idea. Worst comes to worst I could just throw them out, but i know thats wasting the chook food the chooks used to create it. Maybe it would be a better idea to get some meat chooks and some egg chooks? or do meat chooks still lay eggs?
The MAIN concern is what they will eat and how much free-grazing they will have. More free-grazing is great but up your loss to hawks, dogs, foxes, etc..
The few we have at the moment are pretty much free range, and they get locked up into their pen at night. We do have foxes, but not many hawks. They are fed chook food as well though.
I expect that 10 hens and two roosters should meet your needs but it will take some planning. 1 rooster will get the job done but if something happens to him you will need to replace him quickly. This is usually not hard to do.
This is considering your common dual-purpose bird. Special hatchery meat birds will mature much faster but they will eat you out of house and home.
Already commercial feed prices are out the roof and you can be sure they will get much worse.
Best scenario if you don't want to incubate your own eggs is to have a few good broody hens that do that for you. But remember that they quit laying when they go broody and sometimes it's hard to get them started back so figure a couple months out of egg service on the average.
Will they all go broody at the same time leaving me with 0 eggs for a while? or will some go here and some go there? (assuming I have a variety of ages)
It takes a little over 6 months for a hen to mature to egg laying size, sometimes more, depending on the type bird and the weather.
You do NOT have to have a rooster to get an egg but you do have to have a rooster to get a chick. (lots of folks don't know that)
It usually works best to have a single breed for a couple of reasons.
Everything you ever wanted to know about chickens can be found here.
http://www.backyardchickens.com/