Floppy will have it's own IDE connection
Put both HDD (Hard Disk Drives) on the Primary IDE as master/slave
Is the Zip IDE?
If so, You will only be able to connect 2 of the 3 (Zip, CD, CD-R/W)to the secondary IDE, and If you want the Zip, I would personally connect the CD-R/W as the master and the Zip as slave to the secondary IDE and drop the basic CD drive.
If not, I'd still only connect the CD rewriter, and leave space for a DVD/DVD rewriter at a later date. The CD rewriter will read CDs as well as the basic CD drive anyway.