Well, you should read the stickies like Alex spartan177 said, I've only been doing it for a year now, you will mess up alot and your first one will will look not so great.
I didnt read any of the stickies when I started this helmet because I started making this helmet before I joined the forum, but now that I did read them they really help.
But I will answer the question, use cardstock not the mania folder because you cannot print on it.
when I started I stated off with the most basic Halo 1 helmet and moved on from there, start simple do Not go for the hard ones or the HD go for the ones you can practice on, also if you are in school you need to have lots of free time,so do homework first then pepakura,I started this helmet two months ago but did all the stuff in this pic in three days and I only have to print out the last two pieces to finish this helmet. I'll finish either tonight or tomorrow, because I cut my hand when I fell from my unicycle.
thanks for viewing my thread.