How To Become A Wedding Planner

I would like to know what a wedding planner does and how to become one.because i am about to graduate from high school and i am considering going to college to be a wedding planner.but befor i do that i would like to get some more information about what one does and how to become a wedding planner so if you would please send me some information on being a wedding planner i would really appereciate it. Thank You
~Jenn~