gi,

to become a ethical hacker you need to be proficient in certain programming language, should have understanding of data structures and algorithms of different programming language, computer architecture. an ethical hacker works is to find the vulnerability and weakness in a computer system or a certain business tools or websites. you need to have well concept of computer network, there is many certification courses available, most of the ethical hackers has bachelors degree in computer science or computer science engineering. google, coursera, simplilearn, stanford online has courses on ethical hacking. you may do this courses and try to do some internship related with relevant discipline.