A:AnswerIt comes ( as usual) with a keyboard, mouse, power cord and a USB-C to USB-C short cord ( to charge keyboard and mouse via iMac Thunderbolt ports). You definitely would need to buy an additional USB-C/Thunderbolt docking station if you plan to connect USB-A based devices as well as ethernet cable,
A:AnswerThe Keyboard and Mouse are both wireless, to begin with, so they take 0 ports. You only need ports to charge the devices but they work without them.
A:AnswerYou cannot directly attach an old USB thumb drive to this new version from Apple. However, we bought a USB-C hub that will accept up to 4 old-style USB drives which can be uploaded to the newer iMAC.