Experience and an ability to teach is the key, it's all very well having done a few courses and then thinking you know enough to teach....personally I don't think you do.
Teaching imo requires two things, a sound understanding of the skill you are teaching and an ability to impart that skill onto somebody else. I had a maths teacher at school who had 2 degrees and a doctorate in various types of maths, she was clearly a very bright lady who knew her stuff....unfortunately she just couldn't teach it and didn't seem to understand why we found it so hard to understand. On the flip side, my mum was a teacher and very good at it, provided she knew the basics she could teach anybody to do anything.
It worries me greatly when people with limited experience suddenly deside they will set up a school. I, like many on here, have been bushcrafting since before I was a cubscout, all through scouts, cadets and then the army, I've completed some very tough military courses and been on three civvie courses, I'm both Kayak and Canoe instructor, SPSA, Summer ML and various other outdoor qualified and have a degree in Outdoor Ed...add that little lot up and it's the best part of 20 years experience and I still DON'T think I'd be ready to start my own school.....I might be ready to teach a few mates a few things but as Nick says that's very different to charging for your teaching.
What if somebody like myself or Nick or any of the other intermeadiates on here came as a student on your course....would you have the depth of knowledge to take us on to the next level of skills?
I don't mean the above to sound quite as negative as it maybe does and it's great that you want to do this but please don't be blind to exactly what is involved before you jump into it.
The best advice I can give is to get yourself onto some course with the best school you can find, strive to not only complete the course but to pass it well, speak to the instructors and see how they got into it. Ask if you can help out on their courses as a goffer for free and do that until they trust you to help out with the teaching (all of this unpaid), after a few years of this then apply to them (or another school) for a paid instructor role and a few years after that think about setting up on your own.
Hope that helps and hasn't put too much of a dampener on your plans....still go for it but don't be like a student on Nick's courses where you want it all NOW! lol
Cheers,
Bam.