as packfan88c said, gil sharone's dvd is a must have for any drummers who are reggae enthusiasts. Also stated, listed to any bob marley albums, peter tosh, and a good mixture of pop rock and reggae is older NO DOUBT and 311. Also, i highly recommend Western Standard Time's tribute album to the Skatalites. Some very cool stuff on there. I myself when just learning reggae, or any style for that matter, find a good starting point for fills to be simply moving the main groove away from the hihat/snare to other drums for a few beats or a bar. Sounds simple, but that gives you a very good starting point and allows you to feel them out without dropping the beat.