Do the halo ce mc helmet I did it for practice and learned a lot for supply's. Get some kind of glue, 10lb card stock paper, a exacto knife, and lots of time. that should get you started and once you get better you can start resening, fiber glassing, bondoing, and looking kick a** with your new armor. and good luck.
Ps. look at some tuts on youtube and look at the sticky's hear on the forums.