I want to create a circle shaped Broucher in indesign? any help?

There is no way to change the shape of an InDesign page (other than to virtually any size of rectangle).

You could, though, create a circular set of guidelines, and a circular "page" composed of a white, locked circle shape. Do your layout on layers above the 'page' and below the guidelines.

For digital display, place a black layer behind it all so that the actual (rectangular, white by default) page is invisible. After all, there's no such thing as a circular display, so this kind of masking will produce exactly the same effect.

For print, you'll want to hide that black background. If you're hand-cutting the result, good luck; if you intend to have a shop print this, you'll need to talk about the most cost-effective die-cutting options they have. Some shops have a set of standard sizes and shapes and who knows, they might have done an 8" circle or whatever and have the die on the shelf.