Ninja Gaiden noob

umm, i have a problem, its prob been answered before, and sorry to annoy people :(

i just got my ps3 today, and i really wanna get NG, but my PSN account is AUS. so my question is, how do i get my PS to

download NG demo? 

You would have to make a new master account for the US or for japan. Its pretty easy to do once you figure it out.