Which Format?

I am new to burning cd's. I need some advice on which format to use and what type of disc to buy.

I need to make Data CD's that consist of MS-Excel spreadsheets with embedded .JPG images and an Introduction file written with MS-Word. I would like the discs to be able to be updated by the user.
The files will total about 400 Megs.

Also, is there a way to make a clickable menu that opens whenever the disc is started?

To be the most compatible with the most number of users, which type of discs should I use?