Yesterday I wrote (briefly) about publishing short story collections by pointing to a helpful essay by Allison Amend. Her advice is consistent with everything I understand about the process, but since I haven't yet succeeded in publishing a collection, I can't honestly say anyone should listen to me. Listen to Allison instead.
Recently, though, I also wrote about publishing short stories in literary magazines. You can read my thoughts here. But if that's not enough for you, here's an excellent discussion of many of the same topics, with even more detail and links to resources.