Look for a basic shed plan, could probobly find one with free plans and material list,
then do some sketches to add the chicken modifications/additions to that.
I have not seen a coop plan on here that has full fledged beginner type plans/instructions and a materials list.
I am still having a hard time finding a plan or idea that would work for the split or 2 in one design. My idea was to have one side of the house and run for my full size and another side a little smaller for silkies.