A sporting goods store, or a skiing outfitter, will offer prospective skiers tips on the best, skis, poles, boots, bindings, gloves, helmets and eye protection to purchase.  Warm clothing is a must, of course.  Renting may be the way to go for beginners.

After getting outfitted, skiers will want to learn the proper posture and a few basic moves.  A good stance is necessary to keep one balanced and moving efficiently on skis.  Beginners should practice standing tall, feet hips’ width apart, with a bit of a forward lean.  Knees should be slightly bent.  Leaning back will cause the skier to lose his or her balance.  The weight should be centered over both feet.

The Snow Plow is a basic move.  Skis should be in a wedge position: The tips of the skis will be closer together than the backs. This move works to slow the skier down and help him come to a complete stop. Skiers should keep their weight distributed equally on both skis, with the skis flat on the snow.

More info: http://www.youcanski.com/en/instruction/beginners.htm