I want to get involved in pentesting/"legal" hacking. I looked at backtrack5 and blackbuntu, but I dont want to be just a "copy and paste" hacker. I dont have time to go through a course yet, and just want to learn on my own for awhile. I figure the best way to really learn the ins and outs of a hacking OS is to just make my own.

So, I want to make my own "blackbuntu", but where do I get started? What programs should I use? What should I research? etc.

I want to use Ubuntu 12.04 (unless you know of a better OS to use).

Thanks in advance.