If you’re familiar with the new theme setup in Android since AppCompat v21, you’ll need to define 3 colors from the start. That being your colorPrimary, colorPrimaryDark and accent. However I’m pretty sure JUST those 3 isn’t enough for your robust app and to add to it, deciding on colors and how it would look is no ordinary feat (at least for me).
There are a lot of online resources that give us a visual palette to pick from. I’ll point you to one that gets the work done in just 2 clicks!