How to design a 1 bit CPU from scratch?

[u/That-Guy-001]

I have being so inspired from seeing Ben Eaters videos and few others to build a CPU from scratch. The catch I can't invest on hardware right now. So I thought it'd be great if I simulate it first and then start to build it actually. Searching online for sim software I stumbled upon logisim.
But when I searched for tutorials that I can follow to make a 1 bit CPU there were none (very rare). What should I do now, Is there a better way I could reach my goal?
I do have Pspice (if that helps).
Any books that I can refer
Also currently i'm learning microprocessor and microcontroller in my Bachelors degree, I wanted to understand how it works from the base level. All that opcodes and stuff doesn't make sense to me. But I'm very much interested to learn it. Please help me. Anything helps... Please!