There are a few options:
#1
1) "format a: /s" or "sys a:" .
2) Copy mscdex to the floppy.
3) Install the DOS drivers for your CDROM on the floppy.
4) You may also want to copy fdisk.exe, format.com, sys.com, and edit.com to the floppy so that you have some useful utilities.
#2
1) Goto
www.bootdisk.de.
2) Download the bootdisk you need.
3) Install the image on a blank floppy.
#3
1) Check
The BootDisk Project, they have a tone of boot disks (Bunch of different DOSs, Windows, NT, Linux, Novell, etc...) and good info.
Thorin