How can I record video with my camcorder, link up my mic, & use this software at the same time.
That’s where you get good with your video editor software. Audacity isn’t going to help a bit there. We don’t do video.
You shoot your video with your camcorder and separate, high quality sound with your sound recorder and talent microphone—assuming your camcorder doesn’t have a place to plug an external microphone. Some do. When you finish, you load your video and separate sound track and music clips into your video editor and cut your brains out (so to speak). You will probably find that the sound track isn’t going to match exactly the camcorder footage so you will need to shrink or stretch slightly. That’s not unusual. You can use the existing ratty camcorder sound track as the guide for matching up the high quality one.
Please note that hauling a computer, cables, power supply, microphones, etc around with you in addition to the camera and tripod is going to get old in a hurry, so the solution is a small, self-contained sound recorder. Not the computer with Audacity. The talent can put it in their pocket.
This is a lavalier microphone. (ignore the adapter cable on top)

That’s a Radio Shack, believe it or not. A 3013 tie tack microphone (from memory).
A different but similar microphone.

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Full stop. That’s assuming your camcorder has no provision to plug in a separate microphone. If it does, then the separate sound recorder can go away.
There’s no such thing as a “Zoom” microphone. The only way to get good sound is to put the microphone close to it. If you don’t, and you shoot in a room with bare floors and walls, it will sound like a kid recording in their kitchen.
http://kozco.com/tech/audacity/clips/EchoSample.mp3
Or worse, in a noisy machine room where nobody will be able to hear the talent at all.
No, we can’t fix that in post production.
You can see these microphones on any TV news show and even some of the video podcasts.
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Full stop again. If you have a dead quiet room with no bare walls or ceilings (a “studio”), then you can go with any old camcorder. No special sound considerations needed.
DO NOT promise a finished product until you try all this stuff out once or twice. There’s many surprises.
Koz