Hi! I haven't really found a lot of conversation re: lesbian couples/lesbian-related poly things here (my wife and I have a psuedo-triad with another woman), but going through and reading the other posts, particularly about triads, has definitely helped. Some things aren't relevant to the situation, obviously, but it's a good start.
I think bookbug's suggestion re: looking up couple privilege is a good idea, as well. It's interesting to start noticing the things that you wouldn't necessarily equate with being in a couple, especially if it's a long term relationship.