0
You will need Java to tell app what to do. With Java you command app what to do, also Java codes you will need to write manualy or copy paste.
Use android studio to make app.
https://developer.android.com
this is officialy from google. Google maked android, so he knows what is inside system and how to make apps to work with system.
With android studio you will be able to make design of screen for end user.
__
And most important you must have idea. Think about it in silence, what is your dream. Do you want to develop apps for google or some career. Or you will make your own app on your own idea.
No matter what you choose you will attract people if you do it good.
I sugesst you to make your first app, if you dont have idea make basic apps with very good looking, and you will attract popularity, spent more online to help yourself and others.