Well, I wasnt in the best financial shape either when I got promoted, I was some also some 15-20 mil € in debt.
However, I didnt buy anyone except vanden borre in the first season so I didnt lose money on transfers. Also, when choosing a feeder club I chose a club from Japan to increase my merchandising presence there, so I guess that helped as well. In my second season I chose a club from the US and last season (my first Serie A season) i made 50 mil € from merchandising alone.
Also, I sold a few players. Sold Camo for 15 mil €, sold Blasi, Kapo, Tacchi, Mico, Sculli... etc, all in all I made 33 mil € from transfers.
I had aborund 13 mil € to spend on players, so I bought Gourcuff for some 13.5 mil € over 24 months and Marcelo for some 11 mil € over 24 months.
That was it. I won my first 7 games, and was on top from the start to the end of the season. In January after my finances had improved the board gave me some more money and I bought Lucas (10 mil €) and Gonzalo (9 mil €).
Now Juve is almost as good as they have ever been, the bookies have made me favourite to win bothe the Seire A and CL.
So yes, it's all been done fairly, no cheating whatsoever involved