Ben Eater's 8 bit breadboard computer project on YT is well explained, and he sells the kits. I forget Ben's credentials, but he is a professor in CS somewhere. His teaching skill is remarkable.
Some poor sap made a more intuitive set of schematics that also breaks down the kits: https://github.com/Upcycle-Electronics/8-Bit-Breadboard-Computer
That same guy made some chip labels that some people find useful: https://github.com/Upcycle-Electronics/ChipLabels
That last one also has a link to a list of databooks on archive dot org. Get the 1996 Motorola CMOS logic databook as your primary starting point reference. That goes into a lot of the details about cross compatibility and exactly what works and what doesn't.