First watch a 1 hour documentary introduction to American film noir. Then watch Kansas City Confidential (1952) starring Lee Van Cleef, followed by a half-hour Tv discussion of the movie from Cuny-TV. Wnuc.org: radio discussion “Movies on the radio: film noir” (49 min)
Finally listen to Talking History on film noir.
Other film noir related material that is available online:
Noircast.net presents a 50 part podcast series on film noir
Noircity, an annual festival dedicated to noir films, has its own youtube channel