What type of tripod head should I get?
There's really two main types of film heads; pan/tilt heads and ball heads. There are a lot of other features you can get in tripods, for example, fluid heads. A fluid head is definitely something you'll want for video if you can afford one. They provide much smoother panning and tilting motion while operating the tripod. Geared heads allow for much more precise adjustments, but aren't that popular due to their weight and cost.

A pan/tilt head is the most common. They allow for smooth and controlled camera motion, but are limited by constraints of the different pieces, making them harder to adjust perfectly.

Ball heads have a much wider range of motion than pan/tilt heads, but their design makes smooth and controlled camera motions much more difficult.