I recommend you start with your 2016 tax return as you can still amend that return. (You have 3 years from the date you filed or 2 years after you paid the tax due, whichever is later, to amend a return.)
I have attached a link to help you get the prior year TurboTax software so you can start that amended return.
Amend return
You may not need to amend your federal returns if that information is the same.
It sounds like you only need to update California as it is no longer your place of residence. You will need to enter the information into the program but will only amend the CA to reflect that you were a nonresident and were not subject to any state income taxes assuming none of the income was CA sourced.
If anything was from California sources, be sure to leave that as you would be taxed on anything sourced in California even as a nonresident.
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