I'm looking to design a mini brochure kinda thing in full colour but will only need something like 100 copies
What I'm thinking of doing is a kinda gatefold thing like a brochure where you have the main panel in the middle and then two 'wings' on either side that fold in, kinda like this:

What I'd want to do is be able to print on both sides so, for example, when it's folded there is something printed on the front of the 'wings' and when they are opened there is something printed on the inside of the 'wings' as well as the main content being in the middle.
Size wise I'm thinking that, with wings closed, it's no bigger than a DVD insert cover (whatever size that is) but obviously that will be larger when the wings are opened and that it would be printed on thick paper/thin card i.e. thick enough that the paper isnt easily creased and ideally could stand up by itself, around the thickness of a paperback books cover perhaps?
Questions:
1. How should I present artwork to a printer so that they know what should be printed on what panel?
2. As I suspect that I may be talking a custom paper size am I talking mega bucks to get printed, I don't want/expect them to fold it, I'll do that?
3. Anyone know of a printer that could do such a thing and handle a small print run? 100 Max is all I need and even that's probably double what I really need.