Hi
I assume you are wanting to sub-net, even sub-net a sub-net.
So if you want to keep your details a secret, I'll keep my answer a secret. Is it your homework?
If you were to use 192.168.0.xxx
Then I would suggest you have/add an overarching ADMIN sub-net.
16 sub-nets of 16 possible addresses, losing 2 addresses per sub-net.
So you have to vary the address range by using the /24 or 255.255.255.0 and may look like this...
http://www.subnet-calculator.com/
192.168.0.0 to 192.168.0.15 255.255.255.240 /28 14 hosts per subnet.
etc etc.
Of course if you are using 10.0.0.0 the above is all wrong.