Ahhh... I see your problem, the round shiny things in the Final Cut Pro box are not only the handy the custom drinks coaster you've been using them for, but also a semi magical way of transferring information on to your Mac.
Pick up one of the previously mentioned articles and, trying not to become entranced with your own reflection, place it in the DVD drive when asked. Magically it will proceed to write the missing 12 Gigs of information to your hard drive (the computer's long term memory, you can think of it like a huge notebook it is constantly scribbling away in, but squashed into a tiny metal box inside your Mac).
Good luck, hope this helps.