Free Sheet Music
The following links may prove to be a valuable resource for you in that they will provide you with an incredible amount of sheet music at absolutely no cost. The last link will bring you to a site where you can obtain blank manuscript in the event that you wish to do some writing and arranging. I hope you will find this useful.
https://archive.org/details/TDavidFranklinMillionDollarCollectionofSheetMusic_0/page/n3
http://www.donquattrocchi.com/sheetmusic.html
http://www.pmfiddlers.ca/music/
http://www.theguitarguy.com/year.htm
Blank Manuscript
http://people.virginia.edu/~pdr4h/musicpaper/