this is all pretty straightforward if you understand anything at all about vectors and moments.

Do you have any idea how to get started? Do you have any work you can show?

I) you're given a magnitude and a vector in the direction of the force, what do you have to do to that vector to make it a directional vector? So what then is the resulting force vector?

II) you're given the coordinates of P, just turn this into a vector

III) you need to know the vector formula for a moment about a point given the force and the position vector. Look it up in your book.