I agree that it's up to you where you start, but I personally can't do weapons yet. Not saying you won't be able to, perhaps I'm pepakura challenged on closed in things, but I'd do a helmet, or start a suit from the bottom up, if you want a whole suit. Worry about weapons after youve built some other things, and are used to the processes involved in making these props.
Other than that, welcome to the 405th, and good luck!
Krovikan Corvinus