AV... I have some answers for you...
F/O pay is currently $22/hr to start. Don't know how it ramps up after that as I don't collect F/O pay here and never did.
Upgrades? Just around a year if you have the time, or so the story goes. You will need 2500hrs and that as a HARD number. No way to get around it, if I understand correctly, so that will lengthen your time to upgrade if you don't have it. (don't quote me on that last part)
Commutable from the Midwest? I guess it depends upon what you call the Midwest, but keep in mind the company base is in Ft. Wayne, IN. Most current flying is in and out of Pittsburgh, and I imagine most midwest cities of any appreciable size are served by mainline or an Express carrier.
Domiciles are currently Ft. Wayne, Pit, and Trenton, NJ. This has changed in recent months and is likely to change again (though hopefully it will only be adding new bases, not closing current ones, at least two of which are prob. permanent anyway), so don't base your decision on THAT.
Good luck on the interview, and be sure to read the other current threads about us, as there are a few. Some or all of them are likely to provide some useful info.