Selection of Nordic device

I need a battery-powered programmable device to communicate via Bluetooth to a headset, and communicate with another device via serial (TXD/RXD) interface.  Performance requirements are low, need to query the serial device once per two seconds, and in some cases transmit very brief (2-3 words) audio to the headset.  I have quite a bit of experience with BLE in the Apple environment, little with traditional Bluetooth, little exposure to nRF development.  So I'm looking for guidance on a Nordic device to start with, hopefully some tutorials that illustrate how to use the device as described, and some guidance on the necessary starting development hardware.

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