Depending on the model of the camcorder it should have a menu setting for "nightshot". When in this mode the camera uses a infrared light, not visible to the naked eye, but visible to the sensor to illuminate the area.
Some camcorders have a switch on the side to turn on nightshot.

Any Tripod will fit if there is a threaded area at the bottom of the camera. This is a standard size thread.

This would generally indicate that this reader/printer does not support SDHC. SD memory only goes up to 2gb. If it is a multi-card reader it will most likely read other cards such as CF that are over 2gb but not SDHC.

Any good quality UV filter that fits the thread size is fine. The size of the thread is written on the lens (usually next to the glass on the inner ring) as a ## next to a circle with a / through it.
UV filters affect the image almost negligibly but should be put on and forgotten about and never taken off again except for cleaning. It is one of the best protection between the glass of your lens and the harshness of the out side world.
Try and get one for everyone of your lenes.
Dropping your lens with a UV filter could mean the difference between replacing a $11 peace of glass or a lens worth hundreds of dollars.