Nero has a very friendly interface, it's really very easy to use.
If you have the Nero Wizard off folow this steps:
1.- open Nero
2.- Select CDRom ISO option and select multisesion disk if you will add in the future more docs.
3.- The right windows is an explorer very very similar to the internet explorer. The left windows is your project compilation. So you have to drag from the right windows and drop the files into the left windows
4.- look at the toolbar the burn option
If you have the wizard on follow the helps, and select "data disk" but the steps are similar.
Remember that word docs can be compressed using any compress soft like winzip, winrar, etc, reducing very much the original size.