Last year was our first year with turkeys, and we read all of the horror stories about how hard they are to raise... and then we found them to not be much different than chickens, and no more difficult, either. So, after just one year, I can't claim to be an expert, but here are my thoughts based on limited experience:
When young, turkeys are pretty fragile and not very bright, but if you get your heat lamp set up right, they will figure out where they are most comfortable. Like others have said, once they get feathered, they do okay in the cold.
Our Bourbon Reds had a strong tendency to roost, even at a young age. We had to give them some tree branches, otherwise they roosted on the edge of their feeder and pooped in it. Also, as they got older, they wanted to roost higher and higher, so we had to put netting over the top of their brooder box to keep them from exploring the world.
10 x 10 sounds about right for enclosing young birds when you are first introducing them to the outside, but I don't think that's anywhere close to enough space for 12 full sized birds. I know that a lot of people don't think they need much room, but I personally don't feel comfortable raising an animal if it has to stand knee-deep in its own muck. We had 8 birds in an 10 x 20 ft enclosure, and it got pretty yucky from time to time. I occasionally mulched their run with deep piles of straw, which helped a lot with the muck, but, really they should either be allowed to free range or should be given a lot of room. They can generate a lot of poop! Next year, we are going to build a turkey tractor. The tractor we use for our meat chickens is such a super system! Always access to fresh pasture, never any birds on the loose or roosting in weird places.
Maybe some of those points are helpful. I get a kick out of our turkeys, and I'm glad we started doing them.