The typical collective pitch is usually described for designers at 75% of span, where one presumes the lift comes from, and is usually about +2 degrees at bottom collective to +18 to 20 degrees at max, depending on the max speed and the max power of the aircraft (since speed washes out collective pitch, and more power needs more pitch to absorb it).
In rigging, a good flat spot is found on the blade grip, and the angle is corrected to this spot for maintenance manual rigging.
In Navy helos, the minimum pitch is sometimes down to -2 degrees, so that the helo actually sticks itself down to the deck.