No problem with too many questions! You have come to a friendly place!
Let's see I'll answer a few questions.
A couple of breeds that will continue to lay in cold weather are Barred Rock and Buff Orpingtons. Nice calm, friendly too. I would recommend a chicken with a smaller comb ( on the top of their head). They can freeze in cold weather.
But the hens will cuddle up to keep warm and they are covered with feathers! That helps!
Yes, plenty of ventilation in summer. In winter, if your coop is too airtight, you will have condensation that will freeze on the walls and such.
They are fine going outside to their run, year round. They will come and go when they want. If it's too nasty, cold, windy, rainy they just stay in.
Any type of wire for flooring is bad for their feet, if they are standing directly on it. Some type of bedding: straw, wood chips, dirt will be best.
Hope that helps some. Others will pipe up with more answers. Ask away!
I just noticed something else. I would rec you lock them up at night, not matter how predator proof you build the coop and run. Raccoons and skunks are very persistant if they want a chicken dinner. Even if you live in a city, you have some kind of critter that would want to get your henny pennys.