I don’t know why you want just one breed but that is a personal choice. I like to mix them. I agree any of the dual purpose breeds can be good choices but go through the sites Folly mentioned and look at some of the characteristics. Some lay better than others. Do you want broody hens? Things like that. If you pluck them, light colored chickens like white or buff make prettier carcasses because you can’t see the pin feathers as easily. I skin mine so it’s not a problem but with darker colors those pin feathers can be a pain.
Henderson’s Breed Chart
http://www.sagehenfarmlodi.com/chooks/chooks.html
Feathersite
http://www.feathersite.com/Poultry/BRKPoultryPage.html#Chickens
Since you are soon moving, how much work will be involved in getting ready to live there after you move? Is the coop and run already built? How much time you have when you move is probably the biggest factor to me as to when you get chickens. You might want to spend that time planting fruit trees, preparing a garden, building fences, remodeling the house, things like that. It’s something I’d consider.
I don’t know if you are planning to get baby chicks or older chickens but I’d prefer to start with all you want to start with. We integrate chickens of all breeds and ages all the time, but that can sometimes be challenging. With you just starting off I think you’d be better off not integrating right off the bat. Get some experience with chickens first. But that is just my opinion.
I’ve raised baby chicks in the middle of winter without any losses so it can be done. My brooder is in the coop, not on the house. But it is more challenging to try to raise them in the middle of winter. A power outage in an ice storm or snow storm can lead to disaster.
As far as free ranging the chickens do not get breeds that cannot fly like Silkies or chickens with headdresses so they cannot see. Stick with regular chicken breeds, not the exotic breeds.
You can certainly do what you are talking about but make sure you get the facilities for them ready before you contract to buy them. Time has a way of biting you if you are not ready up front.
Good luck and welcome to the forum!