You can ask questions whenever you like!
There are still some of us around to answer. As for the old posts, it seems pointless replying to something from over a year ago, but if you have something that hasn't been answered, feel free to ask again.
Obviously (and I'm speaking for myself), I can't answer everything, but I will try when I can (for whatever that's worth).
Check out this textbook on
Four Part Harmony.