Welcome Newbie! I am not sure if there is a protocol to doing all this right, but I can share what I do. Basically, watch the video on the biggest screen you have, and as soon as you see what the person in the front is doing, try to mimic the move. I pretend they are my mirror image so when they sashay to their right, I sashay to my left. The instructor kicks up the left leg, I kick up my right. Once I know all the moves to a dance, I just play the song off Spotify or where ever it is available and then dance it with full energy! I have a giant playlist from the last few years of doing this. I thought this mimicking might make me backwards to the dance in reality, but my teen daughter and I go to an OULA session in person once every few months when we can and we are (usually) going in the right direction. As far as I know, the only overt instruction is in the breakdown/ choreography videos at the bottom of your browse lists. This will only be a few minutes to demonstrate one part of the newest dance. Everything else is just copycat-ing:)
I do think some instructors prompt a little more with word or body cues. Lizzie is an excellent example of this. I know it is hard to hear, but once you get the muscle memory, it is an amazing workout and really fun. We laugh a lot over the moves and songs (does that count as "core workout"?) Good luck!