Hello JLee96.
I suggest you try to invest in photoshoots before venturing into single producing. Upon starting your game, hire an administrator or two, and focus on business proposals so you can make some quick money. In the meanwhile, have your idols do daily promotions so you can build a fanbase and get the best out of the first single you release when you have enough fans. More fans = more sales = more profit. Don't forget to go for digital releases in the beginning, that way you save some money by not having to make physical copies.
Wish you luck!