This is a support for the star that you can find here.
Download the design in Ldraw here. I made it on a Mac with Bricksmith, but the file should work with other Ldraw software for Lego designs. Read the comments that I added to some steps in the design.
If you are adding a light, MAKE SURE to use a LED BULB. Incandescent bulbs will get too hot and are likely to melt the plastic or even set it to fire!