Lighting
  Ligthing for video production can be exactly the same as for photography or can be completely different. For instance if your subject(s) are going to be fairly stationary, you can use a single, double or even triple light set up, the same as photography. If your subjects are in motion however, your bet bet is to have a good single key source of light and then watch to make sure you don't get too much back lighting (especially if your camcorder is in "auto mode" as most are.)
 

Terms to know:

Key Light: The first and usually most important light that a photographer, cinematographer will use in a lighting setup. The purpose of the key light is to highlight the form and dimension of the subject(s). Here's a link to the Wiki.

Fill Light: The second light in a setup - used to reduce contrast in a scene by eliminating shadows, Here's a link to the Wiki.

Back Light: The third light in a setup - used to seperate a subject from it's background or for special effects. It can also cause a camcorder in "auto mode" to iris down and get very dark if the backlighting overpowers the key light source. Backlighting is needed when trying to create a high quality chroma key or when there needs to be very defined edges on a subject. Here's a link to the Wiki.

Reflectors and Bounce Cards (boards) - Used to direct and possible shape bounced light. The light is reflected off its surface, either to achieve a broader light source, or control shadows and highlights, or both. Here's a link to the Wiki.
  Lighting setups can be very expensive or inexpensive. The differences in reflector fabric, stand quality and even carry cases or bags will effect the cost. You can purchase a two light kit with reflectors or soft boxes for under $200 easily or well over a $1000 for a professional quality heavy duty kit. You usually get the quality you pay for, but starting small is a good way to learn to know what you want. B and H Photo Video is good reputable mailorder dealer, but any photography magazine is always filled with "ads" that can have some really "cheap" deals for someone just starting out. Even Ebay or Amazon have light kits for sale. It really just takes some looking. Make sure to read the reviews if you're on Amazon or B and H's website. That's a good way to make sure you're not purchasing junk that will break on it's first or second use.