a few comments.
go find a professional videographer and see if they will help mentor the effort.
a few comments on the video - these are based on comments from our pro mentors.
pan and zoom - avoid unless you are a very experienced professional. novices generally do not do it well.
always use a tripod.
use a good mic - either overhead boom, under scene boom or handheld, or lapel.
follow the rule of thirds - subject 1/3 inside the frame left or right, and about 1/3 from the top.
if the subject is 1/3 frame from the left side, have them looking straight at the face of a human interviewer off to the right side of the camera,
or flip if the interviewer is on the other side.
brief the subject to talk to the interviewer, not the camera.
go watch channels like the discovery channel and science channel and other networks with the sound off. count off the seconds that a particular frame is on screen.
when doing extended interviews drop visuals of other things on top of the audio track to maintain interest and give the viewer different perspectives.
We have done some videos including a 24 minute impact documentary here:
video library
unfortunately it violates some of the guidelines I stated above but hopefully we will get some more of this cleaned up in 'post'.