You can get the IP address of a machine with
Is this a DSL modem? There might be a web interface for it. Read the manual for it or google for instructions or call the manufacture. It should have a default IP address something like
172.16.0.1 or 192.168.0.1 That is where you can set the DSL modem up. Navigate to that address in a browser and set it up. What kind and model no. is it? Someone may have one.
As far as your machines you will have to have the correct network drivers and configured correctly to work. The hub should work just by plugging into it. Maybe plug one of the machines directly into the modem and get it configured.