Flint, the quality will all be in the original source so find the best mic you can, or at least one you're happy with. The higher resolution the better, though, because you never know what will step on it once it gets in the system.
Your headset mic plugged into a "mic" input may be satisfactory, but it would probably be better in a "line in" input. The sound card in your 'puter should be sufficient for voice recording.
Right click on the volume icon to open up your mic, and other record levels.
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