Not exactly sure what you're after... but workflow is going to be somewhat different between different software packages, and especially if you're talking all the way to manufacture, it's going to be very different along the chain with the software and hardware used and whether or not it goes through other people (like gerber review at a PCB fab vs. doing it yourself). If you want a specific answer from the general public (forum users) you're going to at least need to specify some core software and what exactly you're trying to do (milling, part fabrication, pcb fabrication, pcb assembly, etc.).
If you want workflow within a given CAD package, a lot of the modern ones have pretty good video tutorials which usually outline the steps or at least present them in a way that logically makes sense for the task they're demonstrating, could be a starting point.