You can make money from mobile apps in several ways. Revenue can be generated through monetization of the app itself using ads, in-app purchase, or charging for the download. If you choose to generate revenue from your apps, you should create a Limited Liability Corporation for both tax and liability purposes. You can also make money by coding apps for other people or organizations as a consultant or freelancer. Finally, money can be made by getting hired as an app developer in a larger company. This is a much more reliable source of income than any of the other approaches.