Please help me....

I Have satelite internet connection using broadband...
From broadband it will connect to my switch ( NORTEL)
I have more than 50 Desktop connected to the switch (NORTE)
There are 13 IP address from the subscriber including subnetmusk and
DNS...
So the remaining desktop don't have access to the internet.
From 1 desktop which have internet i want to share to the remaining
desktop...
Please help me what kind of connection should i do.