I am planning on attempting to install ubuntu (or maybe kubuntu, but as far as I am aware these are the same, just one has KDE on it) on an old PowerMac G4. It runs at 400mhz, has 3 and has an ATI Rage Pro AGP card on it. No Airport, but it has ethernet.

Basically, a while back, I tried and failed installing ubuntu on my PC, as I wanted to dual boot, and evidently I did it wrong, and ended up mucking up my boot sector. Anyway, I sort of gave up, until recently, when our media studies class upgraded from PowerMac G4s to IntelMacs. Anyway, I got this machine for nothing. It is running OS9, which I cannot stand, and I really don't want to shell out £55 on OSX when it may not even work, and if it does it will run really slow. So I have decided I would like to turn it into a linux box.

Basically, my worries are as follows:
1. How do I get the OS installed, once I have burn the disk? I have been told to hold down C before I turn on the power, and continue to until it starts booting from the disk. Is this correct?
2. Will I then be shoved into the LiveCD, or what?
3. Since I don't care about any of the data on the machine, and it has 2 hard drives, how would I go about formatting both into a format linux will read? I have 2 20 gig drives, maybe one can be FAT so my windows box can read off it? Can this be done?
4. Will I have to get any drivers, or anything, or will it just work straight out of the box?
5. Will all software made for Ubuntu work on the PPC version of the distro?
6. If I choose to upgrade to a wireless network card, will it have to be a Mac compatible one, or just an ubuntu compatible one? Or does it have to be both?
Oh, and finally, is there any chance of me bricking my machine, so it fails to boot, as I don't have OS9 install disks.

Apologies if this is in the wrong place, by the way.