Adding Peripheral Devices to an iMac

If appropriate drivers are already installed or available in the OS, it's simply plug and play.

In the case of my Android Phone, to access it's contents, I have to install "Android File Transfer":

My Phillips Earphones input by the 3.5mm jack, these don't need drivers as they are a direct output from the sound card which should already have the appropriate drivers installed.

Tethering my phone via Bluetooth took a few tries, but generally once connected worked fine.