Pretty much what the others have posted. As for travel to the interview, they only offered pass travel on Great Lakes (ZK). They did not offer travel on their partner airline, which was United at that time.
During training, you split a room with another new-hire. Unless the policy has changed, you don't get paid until you pass your checkride. That can take 5-6 weeks (pretty much a minimum) to 2 months or more, depending on schedules, sim slots, etc.
The training is pretty intense - a lot of material is laid on you in a short amount of time. As for what to study, have your FAR/AIM knowledge down pat. In the sim, make sure your basic instrument skills are there and be darn sure you understand how to actually use an RMI. (It's not enough to understand "how" it works.) You'll spend a good amount of time memorizing profiles, emergency procedures and limitations, too.
If you can make it through training (and I do wish you the best), you'll get a lot of experience that many other pilots at your experience level won't ever get. You'll fly high density altitude airports, mountains, Class B (DEN and PHX) and Class E airports, and you'll have to learn how to hand-fly very well because there are no autopilots in the 1900D's. That, and maybe 40% of the planes have a flight director on the F/O's side. But you will fly with a small, tight-knit group of people and the Chief Pilot is a stand-up guy.