I always advise that writers interested in coaching check out the persons credentials to make sure theyre actually in a position to teach you what you want to know. And then CHECK their credentials.
Ive gotten complaints from writers about a magazine writing instructor who claims to have written for national publications, but when one of the complainers looked her up on Lexis-Nexis, she had written for exactly one newsstand pub. You need to make sure the instructor has done what you want to do. If you want to make money writing on food, the instructor should have a thriving food writing career. If you want to publish essays in top magazines, you need an instructor who has done same. (And yes, those instructors are out thereI know them!)
Im passionate about helping writers get published and I get PISSED when I hear of people with few or no creds getting into the teaching game to earn a few bucks.