Having some experience will really help you in building a coop but you might want do some reading also. This first link takes you to the top of the coop construction section on this forum. There is some good information in there.
https://www.backyardchickens.com/t/206328/byc-coop-section-helpful-thread-index
While your winters are pretty mild your summers can be really hot. Hot is a lot more dangerous than cold to chickens. This ventilation article is pointed more toward cold climates than hot, it’s probably still a good read for you. But I’m mainly including it for the companion “muddy run” article. Wet runs or coops will probably stink after a few days and are unhealthy. The best time to fix a muddy run or a wet coop is before you build it, in the design phase. Do not locate them in a low spot where water drains to them or stands once it gets there. That’s one huge mistake often made.
Pat’s Big Ol' Ventilation Page
https://www.backyardchickens.com/web/viewblog.php?id=1642-VENTILATION
Pat’s Big Ol' Mud Page (fixing muddy runs):
https://www.backyardchickens.com/web/viewblog.php?id=1642-fix-a-muddy-run
I also suggest you follow the link in my signature. I don’t give you hard and fast square feet per chicken or things like that. It’s more of things to think about when deciding what you want to build. Some of that won’t apply to you, but some will.
A couple of other things. When you are setting all of this up, think of your comfort and convenience. You want this to be a pleasant experience, not a chore you dread.
In my opinion one of the hardest things for people new to chickens is all the conflicting advice and suggestions they get on this forum. With chickens there is hardly ever any one way that is right where every other way is wrong. We keep them in so many different climates and conditions and for so many different reasons that what works for one might not work for another. Even if we have the same goals and conditions, different things work. If anyone tells you if you don’t do things their way civilization as we know it will end, get a second opinion. It’s not always easy to determine, but when you see comments of suggestions try to determine if they actually apply in your situation.
Good luck. It can be a great adventure.