Hola, Cindy,
If you are using Mac, then you can probably get by with iMovie and putting videos on YouTube/Vimeo/or DVDs/USB drives or similar. If you are using a Windows machine, you can search online for free or inexpensive video editing programs. Try these: https://es.kioskea.net/download/editar-un-video-13
If this is for broadcast in Chile, you need to consult with local editors at the TV station about the many technical details involved, and you may have to work through many layers of production bureaucracy. If you just want to show a large group one video at a time, you can also plan what to shoot beforehand, shoot it all in order, convert the video, then post that to YouTube or another online service.
Storage is one of the big issues with doing your own video. So is formatting for broadcast: PAL, NTSC, SECAM? HD or SD?
Again, it depends on your Internet connection speed. I know that the Internet in parts of Latin America (Ecuador, Cuba) can run quite slowly, or at least it did a couple of years ago. I don’t know about your situation or how you plan to get the lessons to the students. Can you say more about that?
Whatever tools you choose, go with whatever is easiest. Editing and shooting video are full-time jobs, and you won’t want to spend all your time editing one lesson!!! I am CELTA certified in teaching English as a second/other language, by the way, so appreciate the challenges you face. Remote language learning is less effective than face-to-face learning, but it’s better than nothing if you are trying to reach remote areas. Others have done it before so there’s no reason why you can’t succeed!
You are a very ambitious maestra!
Buena suerte,
Robin