Linux - Old powermac from year 2000

With bootcamp i am nothing further, that is for mac 10.4 or 10.5 (see the sticky post here).
I know almost nothing about the system i have.
It's a gift, a collega bought a new pc.
This one is an all inn system, a big thing with integrated screen, speakers.
See from the side it is a triangle.
It had standard 64mb ram and running mac os 9.2.
What i want to know is how i can upgrade to a newer os and what os can i run.
The system has now 256 + 64mb ram.
The cpu and graka unknown for me.

What i like to know is how can i boot from the integrated cd drive, and how can i format the disk.
I want to install linux also, i have a power linux distribution downloaded from open suse, inclusive extra languages, and i have the yellow dog linux.
If you need more info to help me starting this please specify what exactly you need, then i start the mac and search what you need to know.
Everything is protected with a password, for example when i use internet explorer 5 to check mij hotmail, he asked the password.
I want to format the thing and install a newer version of mac, and linux at the same time.