There are ten ~30 min episodes. You can watch the first two episodes for free, the rest of them you need a Youtube Red subscription, but you can get one for free for I think 15 days (and then cancel it before the end of that period)
It's a really good show. It takes place 34 years or so after the events of Karate Kid 1. What I really like about it is that it's very anti-PC, anti-SJW. My favorite scene is when one character goes off on a rant about how we should be more tolerant of people and shouldn't hate each other, and he calls for a moment of silence "as we strive to end intolerance in our time"... during the silence, Johnny Lawrence leans over to his student and says "kick that pansy bitch in the face!"