Is this what you are wanting to do?
If so I drew a circle with the path tool. Stoked the path with an eight pixel brush. Duplicate that layer. Transform the new layer and shrink it to make the filled circle. Paint the circle in with a brush to fill it. Center is done. Erase a section of the outer circle. Create a new layer. Draw an arrow on the new layer with the base the same width as the outer line. Then transform and move it to the location that you want it to go and erase the tail. Merge all layers onto a new layer (just incase something isn't quiet right you can fix it) with cntrl+alt+shift+E. Your done. I made a color overlay in the fx drop down menu to change the color.