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Your OS is inconsequential to the type of RAM you need. You know that, right? What model of G4 is your mac? DDR? Quicksilver? Yosemite? Mac Mini? Cube? eMac? iMac?
Look at the pictures and check here:
http://www.macmemory.com/
I'm assuming you mean RAM and not hard drive space. If you mean hard drive space, go to Best Buy or Circuit City and buy a 320Gb Westrn Digital or Seagate EIDE drive. If you have one of the later G4s you can get a 500Gb drive and it will recognize it.