book idea!!

I have a book idea recently but idk where to start. 

My idea is the girl is an aspiring artist. She can only share her music by playing her guitar and singing on the streets. But people barely stop and listen to her. Then she meets this person (im not sure if it should be wlw or not uhmm) playing their original songs at a cafe and people also barely listen to them. The girl approaches them and asks if they should make a band. At first, that person hesitates but after the girl does some convincing like annoying them, buying them gifts, and such, they finally give in. They also meet other band members along the way. Then, when they first performed together like in a music fest or something, they started to gain attention. Which leads to a record label signing them or something. Everyone loved them and started listening to their songs. But after 2 hit albums, they saw the girl having different potential and asking for her to leave the band.

thats what i have so far,, i honestly dont know if this has potential and also its kind of hard cause i have to come up with songs BUT THIS WOULD BE SO COOL TO WRITE

lets see if i get motivated to write this :)