Okay, this sounds silly but you will need to find or make a small 45 degree template, then use it to make a large star point template.
 
 

Four ways to get a 45 degree diamond for your template:
1) The easiest way it to use an existing small template you have from a book or a printout from a computer quilt design program.
2) Download this template page in PDF format.  You will need Adobe Acrobat Reader to get the file. Get your free reader here if you don't have it.
3) If you don't have #1, you can draft your star point in any size from 2" to infinity using a protractor.
 4) You can draft a traditional eight pointed star using graph paper and a compass if you don't have an existing diamond or a protractor. You can also use this technique if you would like to make a traditional eight pointed star in an odd size too.
Okay, now that you have your small template, lets move on to 
How big a star do you want to make?
Main Introduction Page 2) How big a star 3) Fabric choices 4)You need a 45 degree diamond 
4a) If you have a 45 degree diamond
4b) draft using a protractor.
4c) draft  using a compass.
4d)  .pdf format printout		 5) Making a star point in any length
6)  Sew 
    Page 1
    Page 2
7) figure size of background squares and triangles
 
8) Sewing together star points/ setting in the background		 9) Adding Borders

9a) floating blocks

 10) *really easy* Lone Star quilt.