I agree with others so far as the insurance standpoint, make sure that you're well protected personally and that if someone gets hurt under your tutelage you don't end up being sued into oblivion. Sad truth, but true.
I would also ask another experienced and tenured instructor to observe your first few lessons and make sure that you were suitable and effective as an instructor, and give feedback. I have had both good and bad experiences with very young instructors. One was excellent, really knew her stuff, came across professionally and effectively to her students, and was a pleasure to work with, and another had zero tact whatsoever, resorted to yelling and belittling at the first mistake the student would make, and just generally should never have been a teacher to begin with.
I'm not saying or suggesting in anyway that you are the latter, but just saying that's someone who has got the been there done that T-shirt would probably be able to give you some good insight on effective teaching methods, etc.
Good luck! Although I'm personally in no way shape or form an instructor myself, I've also thought about how much I would love to be able to give beginner instruction as I do enjoy teaching. I did an absolute basics groundwork "lesson" (if you want to call it that) with my sister (who was entirely new to horses) last fall and loved every minute of it.
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