General

The equipment needed to play darts is as follows:

A good dartboard
A set of three darts, either soft-tipped or steel-tipped.
A safe, well lit place to play.

Dartboard Measurements

The standard international dartboard is known as the "clock" board. The standard dartboard measurement is 18 inches in diameter and has 20 numbered, pie-shaped segments of equal size, plus the bull's-eye. Each numbered segment has a double ring on the outside perimeter of the scoring area and an interior triple ring (which count as double and triple of that number respectively). The bull's-eye has an outerbull area (also know as the single bull, which scores 25) and an inner bull (also known as a double bull's-eye, which scores 50).

Dart Board Regulations

Dart Board Height: 5 feet. 8 inches from floor to the center of the bull's-eye.
Distance from front of the dartboard to the throwing line: Steel Tip: 7 feet 9 1/4inches, Soft Tip: 8 feet 0 inches. To mark the throw line a simple piece of tape will suffice. Major tournaments, however, use a "hockey" which is a thin raised strip of wood approximately 1 1/2 inches high (see image diagram below).
Mounting: Flush to the wall - not leaning like a picture - with the 20 at the top.
Location: Since darts often bounce out of the dartboard, never put a dartboard up near windows or breakables or where anyone could walk between the throwline and the dartboard. Also, if you have a hard floor, such as concrete or wood, you may want to consider getting a dart mat.
The dart scoreboard should be mounted to left or the right of the dart board for easy access.