The nice thing about H16 class racing is that an older boat in good shape can still be competitive. A jib traveller system, Comptip and double trapeze (along with comfortable trap harnesses) are musts for racing. Other bits can be added as you go.
If you want a training seminar, Fritz Klocke is hosting a H16 seminar on May 24-26 in Norfolk, VA and Rick White has seminars scheduled in FL, NJ and MI. The H16 NA Champs are Sept 29-Oct 3 in Dewey Beach, DE.