I understand your concern, I think there are several complete guides in English, anyway, as in Rising Star I am someone very well known, I am going to try to make a video in English, explaining the most basic things about the game, although I do not know if I have much acceptance by the community, because as I already told you, there are several very complete guides in English, several colleagues have made them. Anyway, in the next few days I will start recording a video explaining the most important parts of the game.
And yes, as you have more fans, the maximum number of starbits you earn for each mission rises. My suggestion is that if you want to take Rising Star seriously, dedicate yourself to doing the music lessons and leveling up your skill as much as you can, that will help you a lot when you are at high levels.
I am currently level 116 and I don't have to worry about taking music lessons, because I did it at the beginning and now I only dedicate myself to farming starbits and leveling up, I have a free and relaxed way.
I am not quite lvl 10. I just started about three or four days ago.
I will keep looking for game tip blogs.