Mom and I are making cookies, of course, and I just drizzled chocolate for the first time. It didn't work very well at first [cough] but I eventually got the hang of it. The trick is to not care at all where the chocolate goes. Fling the chocolate around with wild abandon and the cookies will come out looking great. Use multiple layers -- keep going till your chocolate is gone.
Waxed paper under the cookie racks is a good idea. :)