I need a Guide. (live booting Ubuntu on a G3 Mac)

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My Computer Teacher believes that it is impossible to get a G3 to boot linux. I know this is untrue I see it all over the internet people buy little G3s off ebay and get Ubuntu to run on them no problem.I know with some guidance on how to do this i can do it. but i have to do it right the first time (i dont own a Mac so i cant practice)

what i need-

Where and what OS would be best.
CD or USB.
how to do it step by step.

if anyone could help me id be very appreciative.