I think you'll most likely need to scan in your sheet music as a PDF or some other format which I believe is legal for fair use as long as you don't share it with others' unless they also own that same paper sheet music. Just about all printers now have scanning capability and save to PDF or JPEG.. I've never tried to scan in a PDF or other document with my iPad but I'm sure there are apps for doing this.
Check out the Bluetooth foot controller device AirTurn for iPad or Mac. AirTurn has a site where they list the compatible apps that work with it.
This way you can turn to the next page as needed with the click of your foot.