Love the enthusiasm......
WRT the amount of broody hens I think thats a crap shoot. But.... If you get hens that are a breed that have a tendency to go broody just for brooding you can increase your chances. Then get non setters for egg laying. But there are always exceptions to the rules. When hens go broody they stop laying. so if you want 12-15 egg layers and 4-6 broodys this means you will need 16 to 21 hens.
I had a flock of thirty which included four roosters Many of which were game crosses (bought my restart flock of six hens and fhree roos from a local guy who got overrun with chickens) My original flock was large fowl from the feed store lost them all to predators so I wanted faster flightier birds. By the end of summer my flock was up to thirty Still had three Grown Roos but had about five young cockrels. OMG the hours of laughter those Roos provided......
chasing cockrels and teaching them to mind their manners. No blood drawn. or very little.
I only had three hens raise chicks. Mostly the ittiest little hens they'd setup shop in the rosemary or in a dog house and all the other hens would make deposits. This was before I realized the max amount of eggs my littlest hens could handle is about six. Out of twelve eggs one hen kept rotating the outside ones in I think she hatched four out of that. Thats when started making brooding enclosures around where they were nesting. Once they had the right amount of eggs.
I never moved or separated any hen or hens nest. Much like Stony. I did exclude other hens access after a time.
Now I have About Twenty Wellsummers and four Wellsummer roos. They are non setters I am hoping this spring to bring in some Sumatras. My Roos get along with only a scuffle or two now and then. My Silkey roos are the same way My Auracana roo Not so much. He gets along with the silkeys but even though he is two thirds the size of the Wellsummers he did a pretty good job of beating one up till I got him separated. I learned quickly once you separate flocks its pretty difficult to re combine them. Mr Hot Stuff is going to get his own set of girls once I find some Arucana hens. Or even some Ameraucana hens.
The breeds I had go broody were Game crosses or Easter eggers. So the breeds I expect to have go broody for me will be Ameraucana and Sumatra. I hope to get a couple of silky hens or Silky Crosses for my Silkey boys.
But those are my breeds that I want for my enviorment. HOT HOT and dry in the summer and Cold and windy in the winter.
There is an excellent tool for research on Breeds and personality. Egg production .... even the ability to get along or evade predators..... Henderson chicken chart.
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html Its a fun read if anything.
Whew I wrote a book.
deb