Also how do I mute other players talking so they don't interrupt my steam?
your talking into a a mic, and seeing as how theirs no voice chat in league, whose interrupting you, your friends? and it all depends on how loyal your fan base, it draws away people just looking for league, but if you have a fanbase, they wanna hear more about you, as well as the game.
I think thoughts, opinions, and experiences are good.
When heavily streaming a while back I used to do is as a tutorial out of elo hell(Used a smurf from the placement matches and on). I would explain tips, tricks, reasons for purchases, where to go and why I would do things. Most of the games ended up me just crushing the opponents. But I did not get as many viewers as I had hoped so I have stopped streaming for now.
I found out that most players look to view streaming as a form of entertainment like TV and not so much to learn. As long as you are interesting in your stories, thoughts, opinions and spicy things up you will have fun.