Go to the live Music! Yes, listen to recordings & radio shows, but search out every kind of Folk Music you can find in your area (you don't mention where you are, otherwise, the 'Catters would be listing venues by the dozens) and go there. Find concerts, find jams--they'll certainly let you listen. Find festivals!    If you play an instrument, ask the people at the jams & festivals & concerts if they'll let you play along/teach you tunes/tell you where more opportunities are. Be openminded to any Folk Music you have not heard--how else will you know what you "like?" Go, listen, play, enjoy, ask questions. You'll find what you're looking for.