Career Advise

I am a graduating student of Marketing from New Zealand and I did a semester of exchange program in a well known business school in Montreal. For my exchange semester, I did my final 2 papers for my Marketing Degree and extra 2 papers of Finance. I probably am on the wrong field, but I really want to break into Wall Street. I have been doing my research and I was thinking if I should extend my studies into a double Major adding Finance to it or doing my Masters in Finance. What advise would you give for international students who are wanting to break into Wall Street? I have 2 years of experience as a support role/ admin. Where would you recommend to start looking for opportunities for international people? Thank you in advance for your input.