I'm afraid that this is not something that can be done directly within Indesign. The best thing you can do is to export images of your pages and then use Photoshop to distort them and add them as layers onto a blank brochure image.
Google search for "tri-fold brochure mockup". That will get you a Photoshop file you can place your design into.
Something like this: Psd Tri Fold Mockup Template Vol7 | Psd Mock Up Templates | Pixeden
You can export a JPEG from InDesign. But you'll probably get a better result if you export a PDF file. Then rasterize that by opening in Photoshop and saving in the format your template requires.
Oh, so I also need to use Photoshop to get that kind of layout?
Anyways, thanks Carrie and Steve for all your help and for the link. I appreciate it.
And if anyone knows how to achieve that unique 3d look/perspective an easier way I'd very much be grateful. Thanks again.
Photoshop does 3D, InDesign doesn't do 3D.