Are you trying to prepare your return based on your monthly pay stub -- why did you not have a W-2, even if your are overseas. Since you went abroad on 08/xx/2018, you would not be able to pass the Physical Presence test till 08/xx+1/2019. So why don't you wait till then and thereafter file a return that will allow you to exclude your foreign earned income from US taxes . I am assuming here that you are US citizen/Resident on an assignment abroad.
If on the other hand you are a Non-Resident Alien whom is moving back to your home country and working remotely for your last US employer then the above advice about "Foreign Earned Income exclusion" would not apply and therefore I can somewhat understand your need to use pay-stubs. But it is not advisable -- please , in that case , consider contacting your employer to forward you the W-2 or a copy of it ( because he certainly had to file one with the IRS and with the state).
Please tell me more about your situation, including answers to my questions/assumptions.
