first of all you need to download squid package for your suse.
I dont know about suse but i did it with red hat and red hat comes with built in squid package.
you can download squid from net , first of all install it.
then you need to configure squid file that is
in squid.conf you have to mention your cache size , your ip range of network to whom you are giving internet.
for monitoring and keeping watch on people of ur network you have to check the logs which by default comes in /var/log/squid
if u want to restrist people from accessing certain sites u can set acl for squid.
go get it , install it , and catch him.
thanks and regard