To prepare yourself, why don’t you take a Journey through Middle-Earth? It’s an interactive website, showing Bilbo’s journey in The Hobbit, and giving you the chance to play out iconic scenes from the film.
So far, only three locations are available to explore: Trollshaw Forest, Rivendell, and Dol Guldur. I’m guessing that upon release of the new film, three new areas will become unlocked: Thranduil’s Hall, Lake-Town, and Erebor.
I’m looking forward to exploring them. Onwards!