Hi Joanne, welcome to BYC.
I personally, would cancel that coop if possible and build one, or buy a shed to convert.
You can easily convert a used 10 x 10 dog kennel to a coop/run combo. Good luck with your future flock.
Welcome! If you haven’t already ordered your chicks, don’t forget to check out local farm swaps for babies. It’s a great way to see them first. Also beware of chicken math. I got 6 chicks initially, gave away 3, found 5 more and a rooster and now have 25. No regrets, either.