You will earn money each time a show finishes. You can tap on the Share indicator to check the TV programming. Have a look at the stats to make your TV shows more valuable.

 

However, you will receive some extra earnings every hour thanks to the control room. The more you upgrade this area, the higher earnings per hour you will get. 

 

Try to complete all the quests (folder icon) to close some professional contracts, and increase your cash flow, and get extra gems.