Filling your stadium depends on how much fans you have which you should have lots at your level...I usually put my ticket price at 1/3 of the maximum price and my stadiums always sell out everygame. You may get lesser attendance by little when the visiting team is a less attractive team. Say Old Trafford will be sold out if they host Liverpool but may have few seats left if Norwich visits. For those games lower the ticket price little less than normal and it will be sold out. Cup games can be higher priced same with CL knock out stages. To grow the fan base get good results or sign star players. Like July said, try to fill the house to get 5% possession is better which may give you better results and have more fans. Money in this game is crap, means nothing.