The answer to the lighting question is probably yes, it depends on what the available light is like. Try and get the interviewee to sit as near windows as possible and use a white or gold reflector on the opposite side to fill in the shadows, you may need to bring someone else along with you to hold it. Switch on room lights to illuminate dark corners and if you bring additional lights with you, aim them at the ceiling (as long as it's painted white or gold - you can get away with it) instead of directly at the interviewee. The technique is called bounce lighting and comes from stills photography. If you are going to conduct an interview you will either need two lapel mic's (one for yourself and one for the interviewee) or better still just purchase one handheld mic, like what they use on TV news interviews. As far as shooting interviews is concerned there are probably many threads on this forum that have covered the subject many times before.

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