You are still filing for the tax year ending 12/31/2017, no matter where you lived. If you earned income while living abroad, you may qualify for the Foreign Earned Income Exclusion.
If you only had US Income you will enter it TurboTax as you normally would.
You will need a US bank account for Direct Deposit for a refund or to pay fees.
Here's more info on foreign income and also on filing taxes while overseas.
https://turbotax.intuit.com/tax-tips/general/filing-taxes-while-overseas/L8bP9GN5p
https://ttlc.intuit.com/replies/4231762
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