Try this site, they've got gifs of sheet music for trad fiddle tunes. More stuff in there than you'll learn in a lifetime! I'm currently working on the Keel Row and Roaring Jelly (aka Smash the Windows). Roaring Jelly is a must, simply for the name! :-)

http://www.leeds.ac.uk/music/Info/RRTuneBk/listings.html

(Sorry, I don't know how to do blue clicky things)

Anyway, get some tunes off there, and you'll be well away with a fiddle and guitar, or 2 fiddles, or whatever.