how to spread my talent?

I want to be famous but not for selfish reasons. It's would take up a whole page to explain why I want to be famous so I won't. But I'm 14 and want to be an actress and a model but of course having some fans would boost my career and up my chances. I know it takes a lot of work and isn't easy but I'm willing to commit. I know this probably sounds really selfish and stupid but does anyone have any advice? Or does anyone know anywhere that I could audition for a part online? And also does anyone know how to start my career as a model? And how can I convince my mom to help me out since we don't have a lot of money?