1. Don't use chicken wire on the run (it rusts quickly and doesn't keep predators out), it's better to use chain link or welded wire.
2. Don't buy a prefabricated coop. They are too small.
3. Always build bigger than what you think you need.
That straight run = mostly cockerels (for my dad)
That chickens are addicting (for me :gig)
That chickens only laid one egg a day each, if even that... Cartoons distorted this thought...
And more I'll think of later...