Haven't Played In A While. Where Should I Start?

I haven't played this game in a while. Maybe 6 months to a year. The last thing I remembered playing was Hayato when it first came out and even that was after a long hiatus of a couple of months so I only came back for a few days to play the new Hayato class. I logged in and everything looks completely different. I don't know what half the stuff on my screen is. I don't know anything about new prices, training spots, areas, quests, items, etc. Where should I start?