What is the best way to make a pattern to use on a duplicator? Mostly I want to know what I should use for material for the pattern and any other tips would be helpful. Thanks

All depends on what you have for a duplicator

I have one of those long adjustable scribing tools, I don't know the correct term for it:rolleyes:
and I use this to trace the body shape on a piece of either 1/4" plywood or plexiglass. Line it up and go.

Lexan polycarbonate
is only one step below bulletproof
wood no good, the better your dup the more flaws you will copy.

http://search.ebay.com/search/search.dll?query=lexan&catref=C3&socolumnlayout=4&lotr=1&from=R2&sacategory=36352&BasicSearch=

(leave some for me )

Stainless sheet metal. Somebody around here has a lot of it, right Russ.

I've been using some 2x4 cut down to around 1x2. I trace the pattern out, cut it on the bandsaw, smooth it on the beltsander and with the dremel and then I coat it with some epoxy. Working pretty well.