Can't pair my headset or my Bose speaker to my iPhone 14.

Generally you go into the iPad’s settings and turn bluetooth on (make sure it’s on) and then you follow the instructions on the device you want to pair. Some do automatically, others require you to press buttons or enter codes (keyboards often do it this way)

but without model numbers there’s no way for anyone here to guess what you need to do. Perhaps if you looked on Bose’s support site they may have more device specific instructions.