Start with one, and write it well
The instruction is the whole craft here. A workflow told to report on everything gets ignored within a fortnight; one told to report only when something crosses a threshold you actually care about earns its place. Run one workflow for one client for a month before copying it across the roster — the month tells you whether the instruction was any good, and that is the part worth iterating on.
Two neighbours worth reading: market and competitor monitoring is the most common first workflow, and client reporting is the most common second one.
Related: the product for how the pieces fit together, multi-client operations for running several of these at once, agency operations for the underlying idea, and the other use cases if recurring work is not the job you want to start with.