What is a one-sentence summary of the following article?
There are plenty of brands, so shop around and find a stick that feels comfortable in your hands. A good stick will come up about to your hip when you hold its blade flat against the ground. Play around with the stick, taking some time to push around the small, hard ball used in field hockey games.  The average weight of a field hockey stick is about 21 oz (600 g). Many forwards choose lighter sticks that are easier to maneuver. Many players also carry at least 2 sticks in case they play different positions. Every stick has a flat side and a rounded side. The flat side is the part you use to strike the ball. The ball is plastic and about the size of a golf ball. These are the basic protective tools every field hockey player needs. The shin guards are similar to soccer shin guards but offer a little more ankle protection. You can wear socks underneath them to make them more comfortable. Mouth guards always tend to feel uncomfortable, but they are the most important protective gear available. Goggles help protect you from flying balls and high sticks. They protect the sides and front of your face.  You can get gear online or at most sporting good stores. If you have soccer shin guards, they can be a good starting point as you learn the game. Goalies also need a lightweight arm and leg padding as well as a cage helmet. Most players don't start off in goal, so consider learning the game as an outfield player before you decide on becoming a goalie. Gloves are optional pieces of equipment. Many players like wearing them for additional protection. Field hockey matches are played on grass or turf like football, soccer, and other outdoor sports. Field hockey shoes have small, rubber cleats on the bottom that keep you from slipping while you run. Choose a pair of shoes that fit you but don't feel restrictive. If you have soccer cleats, start with those. The cleat studs are longer but still provide plenty of traction on the field. When you get more involved with field hockey, you can then choose specialty field hockey cleats.

Summary:
Get a field hockey stick and ball. Purchase shin guards and a mouth guard, and goggles. Wear field hockey cleats while playing.