Hi
Ericmurray - welcome to the forum!

Well, I'm assuming that you have 'paired' a peripheral or two (e.g. keyboard, headphones, etc.) to Bluetooth (BT)? If so, when you activate BT in Settings, a list of your pairings should then be presented and will then be 'discoverable' (if close by & also turned on) - clicking on an item will make the pairing. Now, if you have no discoverable compatible BT peripherals in the vicinity then likely nothing will happen (keep in mind that BT is 'short range', i.e. about 30 ft).
Concerning printing, if you are contemplating buying an
Air Print enabled printer to use w/ your iPad, a common Wi-Fi network is used, i.e. BT has nothing to do w/ this Apple technology - please respond w/ further questions, if needed. Good luck - Dave