You need to find the good size for your stadium accordingly with your average attendance...then improve your facilitis or the only way to keep sane your economy is selling players with higher wage....It is expensive, i know, but you need to obtain that your weekly incomes are bigger than your expenses...or you are doing it bad, in my opinion....anyway, you can also try to sell a good player each season to recover money, but in this way i don't know if you will grow as team...
In my case i improved almost all facilities to GOOD level (Bar, Hotel and mega-store) and as soon as possible i will increase also the museum.
in this way i raised my weekly incomes and also the grow rate of my club rating. Then i expanded my stadium up to 29000 because it was almost always full in the last season. In this way i have about 350k weekly expenses wages+manteinance) vs 150k incomes ( but i earn around 300k with just a home league match (stadium quality very good). So i am making money when i play the second home match and extra matches as cups, friendlies etc.
It is a long process to find the financial equilibrium, personally i fix my ojectives each season...a season i invest more in the facilities, the following season i try to buy better players to improve the team...the next season i make the balance and try to preserve the ratio income/expences by improving facilities or selling players and so on...At least this is my way to do it...
