Me and mybestfriend had a fight and...HELP!?

shes been my bestfriend for about 4 years, shes smoking, sleeping with everyone, drinking and she's only 14 =/ i love her she's lia sister! and i wanna write a song about her and all those things an how im mad at her, but idk how to start the song or anything... please if you can write a song for me? id do anything [[NO RUDE COMMENTS]