Open the paint brush sprite editor and draw a target sprite. Make sure it's centered. Repeat the process for the particle. When you're finished name and size the two sprites and hide the particle.
Hover over the sprite creation tool and select the paintbrush. Then draw the target using different colored circles that are all lined up with the center.
Name each sprite using the Sprite Menu to the right of the screen. On the particle make sure it is hidden by checking the eye with the line over it on the second line.