Arduino Micro project with Bluetooth low energy
I have started to look at the Arduino Uno schematics, which are free on the website. To make an Arduino is very simple, just need the chip, crystal, a few capacitors and that's it.

Try to copy the same schematics then add the Bluetooth to the RX and TX pins, but be careful about the 3.3V as you don't want to fry your Bluetooth module :)