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First things first.. there are lots of good rules of thumb.. but what works in one location for one keeper might not work so well for another.. Chickens are a very dynamic species.
Lots of whats written for chicken keeping is written according to industry standards.. example.. using "layer" feed.. is something I NEVER do.. because it's the MINIMUM required nutrients.. not "ideal" per say.. but most cost effective. I use flock raiser with oyster shell free choice on the side instead.. for a multitude of reasons.
I know some county agriculture departments and a few colleges do or have offered what you're asking about in the past.