Mornin! With the win98 boot disk, you should be able to boot up the a:\ prompt, at which point you'd type:
And be taken into the fdisk program on the floppy. You should then be able to remove/create all partitions necessary for your purpose, after which you'll need to format them (after you exit fdisk and restart, boot back with the floppy):
And if you made more than 1:
and so on..