Wow! I just Googled TESOL certification online. I didn't know if this was even possible but apparently... it is!

I did not go through all of the information so I do not know the whys and the hows but too many questions (and a lot of red flags) are popping up in my mind.
Looking back on my certification process, I think that the value of it was precisely the fact that it was a huge "fuzz". I pride myself on having completed something that was definitely not fast and definitely not easy. If something is worth doing (and teaching is), it is worth doing well.
I really hope you reconsider this idea! 