Ok my friend,
On the cisco router, to take a quick glance at all your working interfaces, try the following command,
show ip int brief
This command will show you a list of all interfaces, active or not, their settings, and their current status, i.e. administratively on/off, protocol on/off.
If you want a very detailed info about your interfaces on the router, try the following command
show int
This will show a indepth info list of each interface, one by one. ( you will have to scroll a lot to cover all your interfaces). This command gives more than sufficient information, and will cover your needs for now.
I will stick my earlier suggestion about installing freeware on individual computers to monitor their bandwidth usage.
Hope this helps for now
Cheers