I strongly recommend that you print out these:
http://imas.wikia.com/wiki/Japanese_Geography_Quiz
http://imas.wikia.com/wiki/Reporters_(Idolm@ster_2)
http://imas.wikia.com/wiki/Songs_(Idolm@ster_2)
Although you gonna have to winged it for the DLC songs.
It use those frequently whenever I play, cause going to the computer for every little detail is no fun at all.
I would print out most of the stuff from this site as well:
https://sites.google.com/site/imas2strategy/home
Like the promotions and communications for each character. You want to have all of these at your disposal for immediate access. Well that's how I play this game anyway by having everything I need in paper.