Here's a video on how to get the raspberries in and out of the mold: http://www.youtube.com/watch?v=uuqaPm01Yow
Here's a link to the molds: Raspberry mold
If you make them in the color that you want you're pretty much done, but I think that dusting them a little will make them look better. If you use white, dust them in the colors that they'll be, and if they're colored already dust them with a little extra color for depth.
Next, cut a calyx. I use the little Wilton cutter with five pointed petals. This is white for demonstration purposes, but if you make them green it's easier.
Thread the calyx onto the wire and flatten it against the raspberry using a little water or gum glue to adhere it.
Next, either steam the raspberry to set the color, or dip it into confectioner's glaze. I like the glaze because it give them a shine.
Tap the berry on a paper towel to get rid of the extra confectioner's glaze, then either hang it or insert the wire in a styrofoam block to dry. Excess glaze can drip down the berry, so make sure to get rid of the extra.