I have a 400Mhz iMac that I want to install Linux on.

I'm a Wintel person wanting to explore Linux. I've installed Red Hat and Madrake on a few PCs and played around with it then this iMac was given to me. I know that the core of OS X is Unix, FreeBSD I think but I always like a challeng.

So I have the iMac and I am downloading the ISO images of Mandrake 9.1 for the PPC then I will burn them.

Then what? What is the next step to get Linux installed? Does the system become a dual boot computer? Can you install Linux and remove OS X?

Thanks in advanced for the help.