Required Interview Elements

Will need:

1+ Camera(s) (ideally DSLR quality)

1+ Tripod(s) (enough for 1 per camera)

Lighting equipment (able to light the interviewee)

Sound recorder (external audio capture or at least an microphone connected to the camera)

Will need to shoot B-roll footage, collect appropriate static images / footage etc.

I need to come up with 3-4 questions to get to the root of the interview and settle on suitable filler.

For audio:
Clean up in Audacity with noise removal (create noise profile - few secs of bg noise, then noise removal the whole track based on this noise profile).
Use the auto ducking to fit audio bg track into the gaps of speech in the interview (beats manually inputting).