I, uh, have never tutored here in Korea, but some purely hypothetical advice would be:
- get whichever textbook your students are studying, flip through it, and loosely base your grammar targets on that. They'll have some scaffolding to work with, and you'll be able to solidify and expand on their knowledge, which is great for their grades.
- Whatever you choose to charge, remember that it ought to cover one's prep time, as well as travel time. If you're charging less than 40k per hour (for a single student session), you're undervaluing yourself.
- There are a lot of good apps and social media sites, but word of mouth is often the main method for scaring up students! Although I suppose one ought to be careful about doing so at your workplace (it might be considered to be poaching?)
- Tertiary materials are great for activities and such. Stuff like puzzles, boardgames, media articles, and comic books are a great way to make the lessons authentic, and can provide discussion topics as well, depending on the level of your students!
- Keeping notes (ie google notes, or microsoft word) on each tutoring session is a *really* good idea, as it can help remind you of things like student level, topics of discussion, grammar topics etc. It can also keep track of progression, and difficulties. It can also really help with the book-keeping and financial record aspects of tutoring.
G'luck!
