That's the point of BAREBONE systems--they generally include just the
motherboard, CPU, RAM and case. Sometimes a floppy disk drive and/or
CD-ROM drive is included, but not in the system you presented.
You are expected to complete the system yourself (or via third party) by
adding a HDD, optical drives, and any other peripherals you desire.
It's like those taco kits you buy in the supermarket--they include the
shells and seasoning, but you supply the hamburger and lettuce.
To complete this barebone system, add:
* a hard drive
* a floppy drive
* a CD-ROM and/or CD-RW drive
* keyboard and mouse
* a monitor
* your choice of operating system
The motherboard already sports onboard video, audio and ethernet.