It is always preferable to have a hepatologist, a liver specialist and not simply a GI to help you with treatment. A GP is not trained in liver issues and should be the one to refer you to the specialist.
Questions for the doctor:
How experienced are you in dealing with Hep C ?
Do I need a biopsy before treatment?
How often will I be doing labs during treatment?
What is your protocol for dealing with low wbc or rbc?
What about other side effects?
How often will I be seeing you during treatment?
Who do I contact in an emergency ?
Will I be able to have copies of all my labs and tests ?
Will you be available via phone or email to answer my questions ?