How to create an Android Quiz - java

I'm planning to create an app for my classmates this Holiday So that we will be able to interact, share ideas, and challenge ourselves in a quiz.Like the SoloLearn app.
My Plan
-A user profile
-Home page where users can share ideas with each other.
-A page where users can complete a quiz to test their knowledge.
-The Challenge Zone where users can challenge each other in a quiz.
-.Settings
1.where a user can log in /log out
2.control the sound of the app.
3.switch to night mode and a search button to find other users.
But I don't even know where to start.
Have already download Java version 8, and Android Studio on my PC but I don't know the next step to take.
How do I achieve this goal?

The best way is by learning the course and Moreover it is freely available at https://www.udacity.com/courses/android
Moreover they teach you from very basic level so just check it out i have tried it too

if ever you want to create an app painlessly, consider app inventor from the MIT found here

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