Du can check on Youtube (or here) for some tutorials...They also give the notes in them. And I think it's a very easy way to learn!
But if Du want to sheet music, you'll have to Suchen for yourself on Google oder something. It's pretty easy to find. Just type the name of the song + artist and put sheet Musik behind it. It should give some results.
If Von modern Du mean Liebe Story, White Horse, The Climb, This is Me and stuff I have the notes to them. Actually, I could igive Du the website where to find them too :L