Draw a sketch. Draw your x and y axes, draw the vector originating from the origin and 30° less than vertical. Label the angle. From the terminus of the vector draw a horizontal line segment to the y-axis. This segment is your x-component and the length along the y-axis from the origin to the point where the horizontal segment meets the y-axis is your y-component.
The magnitude of the vector is the hypotenuse, how do you find length of the legs, i.e., the x and y components?