* It must have some acceleration to start moving. A body at rest will remain at rest unless acted upon by a net force. Acceleration is the result of a net force.
* The initial velocity of the body is zero. This is the definition of starting from rest.
* We cannot determine the magnitude or direction of the acceleration without more information. The acceleration could be large or small, and it could be in any direction.
Here's an analogy: Imagine a car parked on a hill. It's at rest. To make it move, you need to apply the gas pedal. The gas pedal provides a force, which causes the car to accelerate. You could accelerate slowly and gently, or you could accelerate quickly and forcefully. The direction of acceleration depends on which way you turn the steering wheel.
In summary: Starting from rest means the initial velocity is zero, but the acceleration can be anything. We need additional information (like the forces acting on the body) to determine the specific values of acceleration.
