Complete orders to get coins, experience points and items to help you with your quests. The order board icon is located on the left side of the screen, to the right of the construction menu. You can also tap on the big order board, to the right of the mansion.
 
 
Regular orders will bring you coins and experience points.
Every 7th completed order is a special order. Special orders are more difficult to complete, but they will also give you more rare items as a reward, such as hammers and other useful tools.
Tap on each order to see what you need to ship and what you will get in return (the rewards are indicated at the top):
 
 
Orders can be deleted using the trash bin button, but you will have to wait some time until the next order will be available:
 
 
NOTE: You can have special orders on the order board. Deleting a special order does not reset the chain of orders.

Sometimes, after completing a special order, you may receive an order to watch a video ad for a reward of 1 banknote:
 
 
The ad order may not appear if you have recently completed such an order, or if you do not have any videos available at the moment.