I am a Computer Science educator. I teach classes 6th to 12th grade as well as run specialized classes for higher level, non-age specific groups.
I would recommend Grant Wiggens' and Jay McTighe's Understanding by Design as a book for curriculum development. It is a great starting point for creating curriculum that can be evaluated and iterated upon.
Amazon link: https://www.amazon.com/Understanding-Design-Grant-Wiggins/dp/1416600353/
Best of luck!
Check out the book Understanding by design. It is a pretty solid model for planning. Understanding By Design https://www.amazon.com/dp/1416600353/ref=cm_sw_r_awdo_4TATBY5D7SRVHSHHY9NN
Also called backwards design, it focuses on starting with the learning outcomes for a lesson or unit then the product that will show student mastery of said learning and then breaking it down into teachable steps.
UBD was the process I used when I started. At this point in my career I tend to, as others have said, just wing it. Though I do pull the proxy back out if I’m struggling with putting together something new.
Backward planning. You figure out your goal and work backward from there. What's your ultimate goal with X subject? How do you want your kid to display that they've gained X knowledge/skill? What do you need to do to help your kid reach that goal?
Grant Wiggins' Understanding by Design is really the book on this, but honestly you don't really need to read the book, it's just that simple.
Other books that have helped inspire me for teaching strategies that also have really concrete examples are Hochman's The Writing Revolution and Sullivan/Liliburn's Good Questions for Math Teaching (also in a 6-8 format).
But you can also just purchase a lot of great pre-designed curriculum that does most of this work for you.
Looking for a PDF copy of this book: https://www.amazon.com/Understanding-Design-Grant-Wiggins/dp/1416600353
$3, paypal.
Edit: Done!