(a) The equation \(|z + 3 - 2i| = 2\) represents a circle on the Argand diagram with center at \((-3, 2)\) and radius 2. To sketch this, plot the center at \((-3, 2)\) and draw a circle with radius 2.

(b) To find the least value of \(|z|\), calculate the distance from the origin \((0, 0)\) to the center \((-3, 2)\), which is \(\sqrt{(-3)^2 + 2^2} = \sqrt{13}\). The least value of \(|z|\) is the distance from the origin to the nearest point on the circle, which is \(\sqrt{13} - 2\).