i dont see problem here if somebody is actualy will pay for mentoring. Some ppl newer played RTS, so you can explain to them. You can open COH2 academy or something, like a school, if you really want to put time in this. But on other side, you can watch pro player on streams for free, you have some great topics with guides, you also have comentary chanells on YOUTUBE, and tournament shows. This are all free learning tools, all you need is interest to read and watch them.
But on the other side, nobody can teach you micro it, everbody have some diffrent sistem. and for proper micro and game understanding and feeling you just have to play a lot of games.
If you wanna have costumers to teach them play, you should probaby open some topic or site, where ppl can read what do you really offer, and prove to them, that you are worth it

This what you trying to achive here is some sort of marketing. To transfer your knowledge to other ppl for money

You can probably get some ideas from SC2 and LOL like you said.