My few observations as I make my coop:
First: have a well thought out plan before you start. I'm nearly done, but failed to plan the pop door. Not so easy to add at this point. Be sure to consider wherr the rain will run off the roof. You probably don't want it in front of the coop, where you will be knee deep in mud.
Since my coop will be inside the run, it must fit through the run door. Two ways around this limitation: Make the individual walls, then carry them into the run to assemble, or remove one wall to the run, and put it back up when done (much easier typed than actually done, especially if you put wire under the run already).
I also recommend using two drills. One will make the pilot holes (I used only screws, no nails at all), the other will have the driver bit. Good luck, and remember, check for exposed screws/nails so no one gets hurt!