You can start your own app development business by following the steps below: 1) Write down your idea. 2) Analyze market research. 3) Decide which platform do you want to build for (iOS, Android, or Windows) 4) Get into the development aspect. At this moment you would have to build your team of coders, designers, copywriters, and sometimes even photographers. 5) Define and redefine your business plan. 6) Find sponsorship who invest in your business. 7) Create interactive prototypes and ask for customer feedback. 8) Figure out how you are going to monetize the apps. 9) Even after you have sold your apps, the clients would still be expecting you to send them enhancements, updates and overall improvement in the apps from you.