You should have 2 places to plug in your hard drive and CD's. On your motheboard.
These plugs are larger than where your floppy plugs in. Your Floppy cable will not work on a cd.
Plug your hard drive into the spot marked IDE 0 or IDE 1 (depending on your board how it's marked) Then put your CD and DVD on another cable and plug it into IDE 1 or IDE 2 (depending on your board how it's marked).
Make sure you set one of the CD players as master and one as slave. There is a place on the back to do that next to where your cable plugs in.
Check what your book recomends,. When you hook them up, make sure the master is at the end of the cable and the slave in the middle part.. good luck!