It's static IP. And thanks for your advice ill do that! 

My friend allowed me to hack him. To be honest, he is a bit of a social engineer
so we want to have some fun and he allowed me to have his IP and all to improve my skills. Though we are not on the same ISP and everything i've learned so far was based on network hacking. So, like I've said don't worry bout the police or law.

And PLEASE don't worry about the law we live in Bosnia. haha 

That's ok (the law and stuff) but i still don't know how to it. Can someone point me to the right direction? 

Let's say it's real and I have permission to hack him. I just cant find how. I was googlin' a couple of days and didn't find shit. As for those book's can you tell me which are those?

The question is simple. How to hack a computer that is not on my network; how to connect to it etc. I.e. I have an IP from my friend in USA but im from russia, how can i hack him, using BackTrack ofc? And pls tell me hacking is not limited to a network.