If you entered audiophila after the 90's just get Kimber wires and grow from there based on what you hear and how changes sound - based upon live music (not recorded) as your reference.

If you cannot get to live music, try any high quality component chain of equipment (analog), Kimber wires as a start, and pre 90's CDs as your reference. Older TELARC CDs is a good jumping off point.