How to convert a text file to an audio file to play in iTunes (and your iPad or iTouch).

Use Zamzar a free online file conversion tool. Simply browse to the document (.doc .docx. .txt .rtf) to select it, then click on the format you want it converted to (AAC, MP3, WAV, etc), enter your e-mail address and "convert". The converted file will be sent to your e-mail. Now you need to put the file(s) into the iTunes library. In iTunes, choose File > “Add to Library,” locate a file or folder, and then click Choose.  Hook up and sync the device. 

Do you want to lock your device so students can't delete apps? First update your device to OS 4 if you haven't already. In the Settings menu under General there are restrictions.  Activating this requires you to choose a pin.  From there you can turn on a restriction for deleting apps.