I am doing 2nd yr bcom and want to pursue a carrer in adversting.so how do i start or where do i start.

I am doing 2nd yr bcom and want to pursue a carrer in adversting.so how do i start or where do i start. i aquired 75% in 12th.after that i had stared studying for the civil service examination but in the course of time i developed interest in d creative field.so plz direct me.