Hi! 
  I can't really give you much advice about eggs because all of my hens turned out to be roosters. They won't lay no matter how much I beg. 
 Pullets will be coming soon though. I will share with you things I wish people had told me.
First, I have a playhouse that I converted into a coop. It is just over 5 feet in height and I am 5'4". I have cracked my head on beams and the door frame too many times to count. It hurts my back to clean it. It makes me hate cleaning it! I am now building a new one with 6 ' clearance. I would suggest going bigger (definately taller than adult birds) to make it easier to clean and prevent problems such as pecking that occur with overcrowding. I am using recycled wood from other projects and a supervisor from a construction site gave me leftovers from their project. I have only had to pay for nails so far and may end up buying a couple sheets of plywood to finish up. You don't have to pay a fortune. Please note that some people are happy with smaller coops...just not me.
 The ONE thing I wish I had known...would give anything to have been told...have learned the hard way. (I'm a little dramatic 
)
Learn about PREDATORS! Find out what you have in your area and build your coop/run to head off attacks. I never noticed hawks until I got chickens, now they are everywhere. I have lost one roo to them and another was injured in a separate attack. Skunks, raccoons, rats, minks, weasles, dogs, cats, bobcats, foxes, wolves, and a few others will prey on chickens. There is a ton of info on here to help you.
Don't let me scare you into not getting birds. Raising chickens is actually fun, they are naturally goofy creatures. 
  I just want you know what to prepare for so you don't learn the hard way like I had to. "An ounce of prevention is worth a pound of cure." You will hear that alot on BYC.
Good luck!!