Kind of loaded question. I hope you know how to copy a file
from your system to a diskette. Suggest you copy your files
with Excel down. Diskettes don't really hold much data 1.44 MB.
If you have high speed access you might mail them to yourself,
possibly zip an entire directory and mail that to yourself. Once on
your new machine you could create a backup to a CD of everything
you transferred. .
Take a look at
Backup your files, always take backups
http://www.mvps.org/dmcritchie/excel/backup.htm