If you have a laptop, tablet or smartphone this will have a built-in mic and webcam and you should be pretty much good to go. We would recommend a headset for any situations where there may be background noise.
If using a desktop PC, or if you find your built-in laptop equipment insufficient you will require a headset with mic and a webcam. You will need to purchase these. We recommend the following based on our experience:
Logitech C920 HD Pro Webcam
Logitech C930e Business Webcam (Recommended option)
Good basic model.
Very good model. Similar to the above option but with comfier ear-pads and a volume control/mute button on the cable.
Logitech H570e or H650e (Recommended option)
Both excellent headsets, highly recommended. Come in stereo (two earpieces) or mono (one earpiece), some prefer mono as it leaves one ear free to hear what is going on around you but stereo maybe better for full attention. Also has controls on the cable.