Again, it isn't an economic system, really, so it can't be "implemented."
You can judge it by studying the works which created it, and the works of its proponents and detractors, and decide who you feel makes a more compelling case.
To get started I recommend beginning with the Manifesto, which is the OG work of Marxism; Marx's magnum opus, Capital, is intended primarily for expert audiences and may come across very dense/difficult to follow for those without a background in academic study of economics. The Manifesto is very exquisitely written prose and is approachable for anyone and everyone.