Success at last! It finally dawned on me that I could look up how to make a starburst pattern in Illustrator on the web. I found 4 variations and tried three. One variation was beyond my current skill level, another variation caused my program to crash several times, and finally the third variation worked brilliantly for me. Eventually I'll try the other three techniques once I have more experience under my belt. Update: here's a link to the SLICKtutorials website where I found the sunburst instructions.