Well the smaller coops are easier for newbies to build. Most people want to start out with 3 or 4 birds. Were you one of those? I know I was LOL.LOL! It was a BIG surprise!! Big surprise and my smallest coop.
I started out with four. My first coop was 4 x 8 feet made from pallets (with plywood for sides and cedar shingles on the outside of that). It was crappy looking, but we built it out of love. I have pictures of the progress. Dylan helped, and it was a hoot.