Hey this is what I did I bought just my office, and office for bussiness. Don't buy dance or music studio. Also buy the doctor's office. Do modeling jobs, then when you have like 300 fans make a radio show. Maybe 1st episode you won't have any profit. But the next episode you will have the profit. That's what I did, and I had 3 radio shows + modeling jobs. Then the idol with less stamina was in the doctor's office.
Buy music and dance studio after you save enough money and not before because you can't make a single right away 1st girls have to model ot get more money, and like I said a radio show and if you buy the dance room and the studio even if you have no workers you have to pay rent which is bad at the start for you. I hope some of this maybe helped. I'm a new player as well.