If you're expecting to insert the scanned material as editable text, that isn't something that Word can do. You need optical character recognition (OCR) software that "reads" the scan and outputs the characters.
If you can't find it or it doesn't work well, and if you installed OneNote as part of Office 2010, you can insert the scan into a OneNote page, right-click it, and choose Copy Text from Picture. Then switch to the Word document and paste from the clipboard.