If you don't know the camera well, you can probably survive mostly on factory settings. You do want to be aware of the iris setting and watch for backlight that becomes overwhelming. Always white balance every time you change locations. When in doubt, keep your shots simple and clean. As you gain confidence you can shoot "walk and talks," but when you're just starting out, find a safe pretty environment to shoot.
I rarely have a subject speak directly to the camera. Unless they are doing a direct appeal to the people watching the video, they should not speak directly to the lens. Sit directly next to the lens, either to the left or right with your eyes at the same height as the lens, and have them speak directly to you. Don't feel like you have to just jump right into the subject of the interview. If you don't know them, spend some time getting acquainted. Ask about what they like to do. Find out who they are and then lead them into the subject you want. The cheapest component of your project is the videotape, so let it roll. This is a technique to make them feel more at home in front of the camera, but sometimes you also discover gems you didn't think you'd find. Also, listen! Don't be so wrapped up in the questions that you have planned to ask that you don't listen to what is actually being said. Ask unscripted follow up questions and closely explore their reactions. Let them control some of the content of your interview. Be very open to finding a surprise and letting it blossom into something wonderful.
Keep track of everything your interviewer says and keep in mind possible B-roll shots that could highlight this dialog. A-roll is when the camera is on the subject and the words are coming out of their mouths. B-roll is footage without sound that is shot to break up the talking head portions of an interview and is inserted in place of the talking head during the postproduction process.
Documentaries many times rely on old pictures or licensed stock footage, but those elements can be expensive even for smaller projects and the licensing can limit how and where you can show the finished piece. Reenactments are a way to create footage that can help fill the needs of the project. If you are doing a piece about the 60s, you can find old civic buildings that still look as if they are in the sixties. Go to someone's attic or to a thrift store, locate appropriate wardrobe, and create your own footage. You can pull this footage into sepia tones or make it black and white in post. You can blend this created footage with the old photos you can find and it will give the piece a sense of movement.
If your documentary is taking a person back to an event or a moment that changed his/her life, if you can afford it, don't just talk about it but go there. Shoot the first time they see this place after so many years and let them just describe what and how they feel. If there is a significant person who helped them at one time, don't just talk about it, shoot them meeting again, and get the energy of that exact moment.
Every documentary should begin as a blank sheet of paper or a canvas to paint upon. What colors you use and what format should come from a combination of you as an artist and the content of your story. Content should always dictate form, but you are in this equation as well and it will be your passion that drives this project. Five filmmakers could attempt the same topic for a documentary and each would most likely create a piece that only resembles the others by subject matter and that is as it should be. Find what excites you, then find your own means to express it.
Randal K. West is the Vice President/Creative Director for a DRTV full service advertising agency.


Live Event Miking
Audio for Video Production: Balanced Vs. Unbalanced
Digital Audio Sampling
Basic Shooting (DVD)
Sound Success (DVD)
Advanced Shooting (DVD)
Documentary Storytelling, 2nd Edition - Making Stronger and More Dramatic Nonfiction Films
Producing Great Sound for Film and Video, 3rd Edition
Audio for Video Tips (DVD)
Field Audio (DVD)