I did my first armor for my Twilight Princess Zelda (pics in my gallery) and there's several tutorials online. I think for a first time the craft foam method is quite easy to do.
As for detailing a lot of people say they used the 'fake stencil' way that is using the contact paper as a sort of screen print, but without the need for lots of equipment. I think that one is on Deviant Art
Hope this helps!
Last Cosplay: Maiden Princess Zelda from ALttP
Last Event: IGN Convention Dubai
Next Cosplay: Ocarina of Time Princess Zelda
Next Events: Games13 Dubai & EB Expo Sydney (Gaming)
My page: Dubai Zelda