Skype Interview (Headphone-webcam)

Your MacBook Pro's webcam is likely more than fine for video as long as your MacBook is 2012 or newer (try it out with Facetime to make sure). Make sure you are front-lit and not back-lit. Sitting at a desk with your MacBook in front of you, a table lamp (not a desk lamp but a lamp with a shade that throws light in all directions) beside that and general overhead lighting is usually enough.

You want the lamp shade to diffuse the light so you're not "shiny" to the camera with hotspots. You want to avoid being back-lit, because the camera will adjust its exposure of the greater light behind you, which will leave you in the dark.

For audio, the stock Apple headphones they started shipping with the iPhone 5 (I think) are a good choice. Don't use the MacBook's mic if you can help it. Just plug the headphones in and you should be fine. I'm talking about the Apple headphones with the all-plastic earpieces (no foam or rubber or anything soft), specifically.

The only drawback is that they don't perhaps *look* as professional as you might like. I personally would not balk at a candidate wearing them, but you never know I guess. If you wanted to go the extra mile, you could spend $120 on a Blue Yeti USB microphone.

Good luck!

I say skip headphones.  I've been interviewed by Skype and I don't think they look professional and that is the image you are going for.  Sure some sound might be lost but practice with your dry run and you will be fine.