Before you get them, you'll want to set your brooder up. If I understood, you'll be using a dog cage? You'll need to line the sides with hardware cloth or cardboard because they will just walk right through the bars.
Good luck! I know you will love your new flock!
Welcome to BYC. When you say "hens that will do well in a coop", do you mean a coop/run combo? All breeds will need sunshine and fresh air, places to scratch, and of course dirt bathing areas.
You will probably want a heavier breed that doesn't care about wandering and enjoys staying near the...