I don’t know anything about Japanese dialects, but my native language is Norwegian, and we have lots and lots of dialects.
I think if you want to learn a specific dialect, the best thing is to talk with natives and try to mimic what they say. The second best thing is to shadow natives (listen to a recording and repeat what they say). My suggestion would be to find some audio material where the speaker speaks the dialect he wants to learn (YouTube video, podcast, whatever) and shadow from that.