Next copy and paste the image into a word document and resize using either guesstimation, or save a scale picture to use as a guide, like from THIS 1/12 scale candy blog post by Toni Ellison. That done, print out your miniature wrapper.
The next step is not essential, but I find it useful as I print on bog standard printer paper bought at the supermarket - take some clear tape and stick it over the picture of the wrapper before you cut it out. It gives it some strength, and makes it look glossy like a real wrapper. Now for the contents. Get some kitchen foil and fold it over until it represents the thickness of the chocolate and fits nicely inside the wrapper.
I didn't take any photos as I was making the milkybar, so here's a hastily done example of these steps.
Finally, use a small piece of tape to stick the back of the wrapper together and, ta-da, you're all done:
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