Common mistakes when drawing hands include incorrect proportions, overlooking the thumb's unique positioning, and neglecting the variation in finger lengths. Another mistake is not considering the hand's three-dimensionality, leading to flat-looking hands.

All you need to begin drawing hands is a pencil, eraser, and paper. As you advance, you may wish to explore different mediums like ink, charcoal, or digital tablets, but starting simply is often the best approach.