The key would be to go to some small music shops wherethey have a lot of good imported vinyls or cds.. well then start to discuss with the guy who is running the shops and you'll learn all about what's good and not good etc... I guess its a way to start.

ALso, go to some parties, some DrumNbass parties, some Trance, some triphop, some AcidCore... etc.. you'll get the difference.

Good luck