Arduboy clone with Arduboy

Arduboy was originated from Arduino Leonardo. In fact, beside the RGB LED (In real fact, you can connect whatever you want to the Arduino Leonardo), the display, the size, the battery, the button, and the beeper, it works almost indifferently to its older brother(proven the Leonardo was running something close to what the Arduboy is running)
Let’s say I got my Leonardo. What’s next?

Next you read this thread: