A vector already points, without needing an extra. I wonder if you mean "Poynting Vector" which shows the direction and magnitude of power flow in radiation.
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The head of a vector arrow represent the time traveled
Yes, in which case the resulting vector is twice the length of the original, pointing in the same direction.
A vector always consists of a direction and magnitude. For example, a vector representing the weight of an object that is 35N would be represented as an arrow pointing downward with a magnitude of 35N. You could also represent the weight of 35N as -35N, in which the negative symbol indicates a downward force.
You cannot, unless it is a null vector. As a point.
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