what courses should i take.

[Mahdi]

Try to learn more about cryptography, networks and learn C very well to know what parts of your code can be exploited

[r4BBiT]

And what you guys think about CISCO certificates? Im thinking about taking this course in my high school. Is it good to have one?

[fastnet]

This is two years late, but if someones sees it it will be very helpfull. There's a good book called Hacking Exposed

http://www.hackingexposed.com

It's a little advanced for total newbies but is a good resource and whatever you dont understand look for it on the internet and learn.

If you manage to understand this book and practice, you are in thw way to be a security expert...well good luck!