1. Most rotors have a "droop stop" at the hub. This keeps the blade from hitting the fuselage when the rotor first starts turning. That means the blade will extend straight out or at a small downward angle from the hub with little bend for the most inboard portion of the blade.
2. The outboard end of the blade doesn't curve as much as the middle. That is because there is less weight outboard to cause bending as you move outboard on the blade.
3. The most curve is very roughly somewhere between 20% and 50% of rotor diameter. The inboard end doesn't curve as much because of 1 and the outboard end because of 2.
This is an illustration from a discussion of the shear and deflection of cantilever beams (http://www.codecogs.com/reference/engineering/materials/beams/cantilever_beams.php) that illustrates the general rule: