Take a look at the limitations for your autopilot. Most likely the minimum altitude will be 200 feet on approach. Many autopilot systems also have a flap limitation so using the autopilot with full flaps down to 200 feet may not be authorized.
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However, automation also has the potential to cause significant incidents when misunderstood or mishandled. Furthermore, automation may result in an aircraft developing an undesirable state from which it is difficult or impossible to recover using traditional hand flying techniques.
The autopilot does not steer the airplane on the ground or taxi the plane at the gate. Generally, the pilot will handle takeoff and then initiate the autopilot to take over for most of the flight.
As for actually using the autopilot, more often than not most pilots use it after a few thousand feet at most. Hand flying to altitude is very rare and only a few guys even regularly fly it up to 10k. Pilots new to airliners tend to turn on the autopilot early and keep it on until about 1000' before landing.
The autopilot can take part in most of the control mechanisms except takeoff. In general, it controls the movement of the aircraft around the center of gravity and directs the aircraft according to safety parameters. Route data prepared before the flight is uploaded to this software.
If turbulence is unavoidable then FCOM procedures and recommended techniques must be applied to limit risks of injury to passengers or cabin crew and damage to the cabin: Keep autopilot ON.