Help with Qemu and Sudo commands for a Mac newbie

Hey, I've run into a few problems, most likely due to the fact that I don't use my Mac often, and I'm attempting to use Terminal ..

Basically, my goal is to install Windows XP using Qemu, which brings me to my first problem;

1. I'm really not even sure if this is possible, or if I need a physical boot CD, but what I've done is made a folder containing all the files that are on the Windows XP Boot CD. As I don't currently have any blank Discs, I have nothing to copy the folder to, and so I was curious if I could boot Windows straight from the Folder that I've put onto my Mac. Please let me know if this is even physically possible, or if I should round up one of my old Boot discs.

2. I'm not familiar with Terminal at all, and may be about to ask some dumb questions, but is it normal for none of my Sudo commands to work?
While looking at some Guides for installing Windows on Qemu, I've come across many Sudo commands as well as many other commands, none of which work. I type them into Terminal, it asks me to enter my password, and once I've done that it'll say "Sudo: ____: Command not found." I then tried to install Fink, but the installation kept sending a Failure Message and closing itself.

Any help with these (hopefully easy) fixes would be much appreciated, Thanks.

Mac Os X 10.5.8, G4 PPC Desktop running Leopard if that's of any use to you.

Also, YES, I am aware that Windows on a PPC Mac would be slow if even usable, but I only need Windows for one extremely Simplistic program.