Steam was a pain in the Arse for me too.
I try not to make videos about subjects where if someone asks me to explain how I managed to do 'random example 1' my first thought isn't 'oh I just tried 8 different things and it eventually worked'.
So I will hopefully get to practice more with Steam and make a video, eventually... but I don't want you to wait for me if your game is ready soon. I looked at a few videos about it and didn't find the one I used, but this one seems very good:
youtube.com/watch
I will also keep looking for the one I originally used and add it here if I find it.