If you are a US Citizen and have never filed a US tax return (but should have been), you need to go to a US tax professional that specializes in this type of thing. This is NOT a Do-It-Yourself project to fix the past.
After you have the prior year problems fixed and dealt with, then you might be able to do new returns on your own (depending on your circumstances; although TurboTax is not particularly friendly with non-US things). But as I said before, for this year (current year and to fix the prior non-filed returns), you really, really need to go to a good tax professional that specializes in this type of thing.
