The easiest way is to scan and than email it to yourself. Once you do this, you can open it in ibooks. Another way is to get an app called Dropbox for both the ipad and your PC. If your sheet music is on your PC-you can slide into a Dropbox folder and once you connect to wifi on your ipad-you will be able to load your music from there. You can than save onto your ipad if you want if you don't want to keep accessing it from your app. Hope that helps!
Also: Welcome to the iPadForum! This Forum offers so much information related to the iPad (original-New), Acessories, Apps, Help, and Apple News.
The iPadForum also includes a Regional Ipad Group for international users across the world. This is a wonderful area to "find" members from your own country. Regional iPad Groups