Allchopin, why is your question now only hypothetical? Do you no longer wish to teach, or were you only thinking about the idea, or were you just bored and wanted to chat?
Either way, here's a hypothetical response to your hypothetical question.
Here's two of my favourite sites for piano teachers.
https://pianoeducation.org/https://www.practicespot.com/Teaching, as you may already know, isn't just about how well you play the piano. It's about lesson planning, knowing your resources really well, understanding the different ways people learn, knowing how to communicate an idea to a specific age group, knowing how to break down a concept into elements that can be grasped logically and in stages, helpful if you know a bit of psychology, important to have an established 'bag of tricks' for all sorts of different problems that arise.
This is why it's also a good idea to have lessons yourself. Not because it may benefit your playing, but because you can see first hand how other teachers go about doing these things. Most teachers have taught the way they were taught themselves. Sometimes these has given good results, sometimes not so good.
But do lots of research, gather lots of ideas. The net is a fantastic tool. Get really well acquainted with Google.
Check out
https://www.musicroom.com/Browse/Genre.aspx?category_id=store6_arrangementgroup5_arrangement61_genre29to get acquainted with method books. I don't teach with methods (although I have quite a few in my library and I do use pages from a lot of different ones). But if you've never taught before, and haven't had lessons with a teacher, then buy yourself some method books at the beginning level and read through everything.
Then teachng is all about practise! Not piano practise, but teaching practise.
I'd suggest you keep a log/record of your lessons so you can analyse what you think worked really well, and what didn't work for that student.
Invest in some non tuned percussion instruments to use for rhythm exercises. Get a white board and a permanent marker, draw a couple of staffs and use this to teach note reading and writing.
Always remember to introduce a new concept to a student in at least three different ways. Always ask questions, and get them to explain or demonstrate to you so that you know what they do and don't understand.
Have patience. People have spoken about the damage that can be done to their playing, but more important is the emotional effect an adult instructor can have on a child. Many on this forum have spoken about how words cannot harm. This is so untrue - especially for children. So choose your words carefully and be sensitive. This is not a contradiction in being firm. You can be both. It's all in the delivery.
If you have specific questions/concerns/problems(hypothetical of course)post them. Of course you won't know what these are until you begin teaching.
But first, prepare yourself, teaching is not just playing the piano well.
All the best allchopin in your hypothetical journey!
