Re: more info - Just a brief 1–3 paragraph professional bio and perhaps a link out to more info about how long you've been doing writing / editing, not necessarily a resume, but something like a LinkedIn perhaps. I don't have much opinion about personal anecdotes on a professional site that ties into your professional work; I keep it to a minimum myself, and it's not something I'd discount for a one-person company where their business and their self are somewhat intertwined, but I don't explicitly seek out personal info. I think being a teacher is potentially relevant to the business you're doing now and communicating feedback to your customers. My mom is a teacher as well and that was influential in the way I learn(ed) at a young age (Montessori method) and still today.

Re: experience and credentials - I feel like the best way to demonstrate it in writing is just to link to a variety of sample work before/after. If you want to build a base under that with past experiences, I think that can be helpful but as you've stated, it can be challenging to convey how seemingly unrelated experiences tie in to current work.