Even though the beginnings are always tough, they are also exciting. Well, at least to me.
A little search on the Internet and I find the web site maintained by William Shotts. The address is:
I also find a quick and amazing tour for beginners with Linux.
I think everyone using Internet understands what John Carmack meant by saying: "[... cheap PC, linux and an Internet account and you have all necessary tools [...]".
After this nice one-day-test-it-out introduction/tour I am almost ready to rock (I have already started to read the book, but that will take few days to read and experiment with the commands).