Hi
When you refer to the 'Go to Page ID' do you mean the 'Target ID' field?
You make these up yourself and use whatever works for you - just make sure the Target ID matches the Unique ID of a question, result or information step.
E,g, lets say you have a question about selecting an authoring tool and the choices are commercial, free, not sure.
You then create the destinations for each of those options and give each a relevant ID and then put those ID's in the 'Target ID' field of each option.
HTH
Ron