Do I need a stereo vcr / S-vhs or just regular vcr for the
finished work I'm coping to tape from my computer?
What is the difference between 2/4/6 heads in vcr's?

A Hi-fi Stereo vcr will record stereo sound for better quality.
If you have S-video output from your camera or analog to digital device, then an Svhs vcr will record a better quality video signal.
2 head vcr is just playback, with no slowmotion or clear scans in ff. 4 head has clear pause, slowmotion, and scan in ff/rw. 6 head adds two additional audio heads for the hi-fi stereo recording/playback.