All the information you will need is available – always google for
arch wiki or arch linux and then your issue
We googled for
arch linux wireless headset
https://wiki.archlinux.org/index.php/Bluetooth_headset
Then we just read and see what we like or need.
Then I would make a script because next time I do a re-install I do not want to be bothered with this technicality again.
Study once, try once, … it works – make a script for next time.
Your headset will
automatically play your music
Switch your headset off and on
after a reboot
and autoconnect