To the first, I am not entirely sure yet. I would start out with a 25 batch I suppose then cull the cockerels once they become an issue. As for breeds, I am not entirely sure. That is another thing I am seriously thinking about. The Silver Wyaonette look amazing but I need to make sure whatever breed I end up with is a good forager.I don't think there's a definitive universal answer to those questions, which is what I was trying to suggest earlier... And you haven't even specified how many chickens, what breeds, or what you'd be wanting out of them, or know what kind of climate region this property is going to be in, how big it will be, and what's already on it--or any of the other variables I mentioned in my first reply...And knowing the land is really everything...
I imagine when it comes time someone with local experience would be able to help you more with specifics. And ultimately you'll learn for sure what works well and doesn't in practice. I'm just trying to help by suggesting things you MIGHT want to consider. It sounds like you're smart and on the right track though, so I wish you the best of luck with your vision!
Out of them, I mostly want eggs but I want one or two to go broody and raise chicks so I can cull the chicks for meat. I have no idea about where it is nor the actual size. I am going to be looking for property anywhere in the US that meets my criteria. I will definitely have other farmers near me though because I really want land in or near an Amish community because I will be going nearly electricity free with no car. I can't drive a car but I CAN drive horses with the best of them.
That is why the question then becomes what do I need to grow for them because I don't want to be relying on someone else to feed my flock. My goal for my farm is to be self sufficient and not ever need to go to the market (unless I want chocolate or spices). That means one of the big questions becomes what each animal I have needs in terms of dietary requirements so I know what I need to be growing and how much. I have already done the calculations for the horses and me, now it is time to factor in the chickens.
Maybe when I finish factoring in the chickens I will realize I need more land, who knows. For me, this is planning for 10 years down the line. Knowing what point my savings need to hit to buy the best piece of land outright (I will never have a mortgage) and set it up is a big part of it. Do I need to get more than a 15-35 acre allotment? If so, then how much more do I need to save to afford it? Where is the best spot to buy the land? Will I be able to cope with a house and barn that need a lot of fixing or do I get less land in order to get a decent house and barn? These are all questions I am researching the answers to.