This is what I have, but the mid-2014 version. I cammed on it for almost 2 years when I started out! Heck, cammed with it for like a month this last summer. They're pretty tough and user-friendly. One thing I would suggest is also getting an external hard-drive, the one you're getting is going to fill up quick. And some sort of cooling pad, that aluminum gets HOT when you're making that 'puter work! The built-in mic and webcam are actually fairly decent if you're just starting out as well, not going to give you crazy good HD but I believe it'll do 720p. I used it for a bit when I was having issues with my webcam last year and no one complained. If you're going to play music in the background definitely get a separate speaker though because it'll drown out your built-in mic. Of course upgrade your webcam with a good mic when you can though if you haven't got one already, I suggest the c930e for Macs. Also the 13-inch is totally sufficient with the retina display, it's small but everything comes out crystal clear.
That all being said, you can get a PC for cheaper with the same type of power (or better). I much prefer to cam from my PC, but that MacBook will last you a long time! I'm typing from mine right now, it's a great personal laptop.
