I ordered my first meat birds from a local hatchery. I am going to pick up 10 Cornish X's on Tuesday. Are there any recommendations on what to feed them. I've never had meat birds before and I want to do this in the most economical way possible. Also with housing, I'm thinking of just using a pen I have out in the yard. It's covered so they wouldn't be rained on or anything but it doesn't have all the roosts and boxes that my laying hens have. Will that work?