http://www.allbusiness.com/12-step-guide-to-building-your-first-mobile-app-11193-1.html#.UoUPqqW6LlI 

1. Define Your Gola

2. Start Sketching

3. Research

4. Create a Wireframe and Stroyboard

5. Define the Back End of Your Mobile App

6. Test Your Prototype

http://www.allbusiness.com/build-first-mobile-app-12-steps-part-2-11896-1.html#.Usrslv26LlI 

7. Build the Back End of Your App

8. Design the App "Skins"

9. Test Again(Yes, Again)

10. Revise and Continue to Build

11. Refine Each Detail

12. Release Time