I volunteered to do some video recording for my work which will be an interview setting. I currently have a 60D with a Canon EF-S 18-200mm f/3.5-5.6 IS lens. Any advice on additional equipment (lighting, sound recording, lens) to improve the quality of the filming? I am working on a small budget so I am thinking under $250 total in equipment upgrades, but potentially could stretch that to $500 if it would be a significant leap in quality. The interview will take place in a professional office. In addition, any advice on filming techniques and camera settings? Any advice is much appreciated.