Yep... you're not slandering anyone, directly or indirectly. Creative liscence allows you to say that the events in your song do not depict real events, but can be influenced from your life. At least that's what I was taught about cartoons and comic books.

On another note, if you're planning on making money, the first thing you should go do is see a lawyer. I mean, that's wise for anyone who's starting a business venture.