Carter Thomas from Blue Cloud Solutions makes building a mobile-app sound easy with 5 steps,  providing steps, strategy, insight and recommendations to help guide the process. 

1. Research the Market
2. Understand the technical steps
3. Register as a Deverloper
4. Find a Support Community
5. Create an Action List

If your planning on beginning the steps  and have never heard the lingo such as 'Wireframing', or softwares such as Swift, Click this link to the article containing the resources you need to begin.