Hi Cloud10 -
I'm sure you'll find help here! This place IS a DIY site! And a damn good one if I do say so my damn self.
For Darth Vader stuff, you'll have to go to the 'Popular Franchises' menu to the 'Star Wars Costumes and Props' section. Once there, you can use the search to find all sorts of Vader goodness.
At 6'7", you're going to make one impressive Vader!
Enjoy!