Sitting - images of the 'lotus posture' may put people off (particularly those with bad knees), but it is not entirely necessary. Sitting upright and straight, but not rigidly erect in a position you can comfortably maintain for a long period.
Breathing - in through the nose and out through the nose. Not forcing the breath in any way. Be comfortable, be natural.
Mind Training - as a beginner you will find calming the mind to be the biggest obstacle. Simple techniques of counting breaths or relaxing body parts to the exclusion of everything else is a useful tool until you can do it naturally.
The benefits of meditation to improve your mood has been increasing in popularity in Western countries, and as high stress levels are a problem with many modern workplaces, what better subject to investigate than one that helps people relax.