Whiterabbit has a point... Here's a link showing you how it's done with fiberglassing the inside first.
http://405th.com/forums/index.php?showtopic=10821
It's a good tutorial (thanks crackhead)!
But either way works fine... you just have to figure out which way will work best for you. Just remember that if you resin the outside first, make sure you have supports on your pep file, otherwise it can warp really bad.