VYork88 - the fact you said my arms look great literally made my day! I started out doing simple weight exercises. I would do hammer curls, lat pulls, tricep kickbacks and laying tricep extensions. I also do things that use arms but aren't specifically for them (dumbell press, bench press, flys, etc). I started with small dumbells and I am always trying to increase my weight. I love seeing the muscles grow! I love adding new exercises. It's all about the weights! And don't be afraid to add weight. You won't get too bulky but you'll really firm up.
I hope that helped. =)