I've got a fair bit of experience with this. Well the fiancee does. I make the shatter and she makes the candy. We do hard candies with silicon molds. I prefer the ones with the little squares. They are much easier to pour, with minimal waste. We make ours with 10mg of concentrate per candy, by weight. I also recommend the Watkins brand of flavor extract.
The root beer and lemon extracts are the raved about flavors over here. Root beer blends with cannabis flavor nicely. The lemon mixes with tangerine kush shatter and tastes just like fruit loops! Anyhow I digress, good luck and have fun. Oh words of caution with hard candy, if you add too much shatter to a batch, it won't set up properly.