Where to start?

OK, so I found Kodi and installed it on my Galaxy Tab S. Now what? I see tons of info on installing kodi. A google search brings up all sorts of information on downloading apps, installing various functions that seem to do everything from nothing to cooking dinner. People drone endlessly on youtube videos. But there is no basic information about how to use Kodi.
Apps galore with varied, weird and creative names, but no listing of what they provide. OK, so ABC Family is pretty clear, but what does Faroese do? What is a Faroese? Far too much jargon for a limited audience and not enough plain english instruction for those of us who just want to use.
For instance, I can open the app, but there are no instruction on what to do next. Believe me, this is not intuitive for the average person.
How do I get my Kodi to play a movie? Do I download it from somewhere? But wait, I thought Kodi was for streaming, like the way I stream HBO GO to my Chromecast. Metadata to a library? What library? Why?
If I have to download, should I do this on a PC instead of my tablet so I will have more storage?
I need basic stuff here.
Where do I go and what do I do after I open the app? Suggestions?