the DIP switches near the arduino pinheader are connecting the MCU to the rest of the hardware. So when you need the pinheader maybe for a arduino shield or what else, you have to switch off the DIP you need.
DIP ON -> tinylab
DIP OFF -> Arduino
the small 3-Port DIP on the bottom of the arduino is to control the SPI.
DIP ON -> onboard SPI (sd card, NRF)
DIP OFF -> SPI Pinheader
the last DIP near the 7-segment display is (like it is written on pcb) to control leds/7segment.
DIP OFF -> only LEDs through D10-D13
DIP ON -> LEDs + 7Segment (MAX7219)
The unlabeld bag is the bluetooth module. You can confirm this when you search for HC-06.
You do not need the included cable, so you can just plug it into fhe bluetooth connector ( pay attention on the direction).
On my board the right-bottom screw is missing too but i don thing i need it.
Maybe a community-wiki would be usefull, too 🙂
@axel50397 The seal on the buzzer you can remove.It is just needed through the pcb-process.