Do yourself a favor. Start off with Unbuntu, another Linux distro, which is much more forgiving for a beginner to learn. Learn that, and learn it well, before you even consider coming back to BT. Learn the basics for a year or so; things like the command line, file and directory structures, and the intricacies of TCP/IP. After that, come back to BT if you want to start learning about computer security specialties.
This may help: