External audio for video recording?

Hi there, so I got a new camcorder and I love making videos, I have Vegas Pro to edit, everything's great...I just want good sound now. Can anyone give me some tips on making videos with external audio recorders? My camcorder doesn't have an input for a mic so I'm gonna have to get a separate one. Not too expensive, I'm not wanting to make a professional interview video, but something like a body mic that clips to your shirt would be nice. I've looked some up and they JUST come with the mic, not sure about compatibility with the actual recorder...but ya, just something like that would be nice, or even a good actual mic that we can keep just outside the shot, but will still get the people talking. I appreciate all answers :)