Well, I've gotten so much information from backyardchicken.com and mostly from people like you who have made it sound easy to just DO it! I started my new chicken coop today!
It's a big one, 8 feet wide by 16 feet long, the highest point will be about 7 feet, my husband didn't want to bump his head and I wanted to put a vent above the door.
Here are the first two images: I started with the floor and put in braces between the joists, I leveled the base on concrete blocks as the ground is "rolling". The flooring helped me to keep the base square.
Then I used some leftover linoleum and covered the base, I used a staple gun with 1/2" staples in it to put down the corners. I'm hoping that when I clean out the poop I won't lift the corners.