I am a noob, but I have grand ideas.

I was filming my buddy working in the hot glass shop and in the process over heated the camera. Next time I film in there I would like to get some of the background noise. I now have the GoPro frame and the mic adapter. what kind of mic should I get? If I enjoy all this filming and editing I'm going to upgrade to a GH3, so I'd like a mic that would complement that as well.

Take a look at the Rode Video mic. The Sennheiser MK66 with K6 battery capsule is a good choice as the battery can provide the power for the mic capsule absent of any phantom power supply.

-gb-