How can I file without a w-2?

[Marketstar]

You should wait for your W-2 to prepare your return

The information on the W-2 does not always match the final paystub.

Your employer should send it to you no later than January 31, 2018.

See Can I File Using My Last Paystub?

[mesquitebean]

You should wait on it as advised above.

The IRS will not start processing returns until January 29.  If you efile before then, your return will be stockpiled on TurboTax servers until the IRS starts pulling them on January 29 (except for a few test returns pulled early.)   You won't be able to retrieve the return if you notice a mistake, get an additional W-2, 1099, etc.   If you efile at this early point in time and need to change something, you'd have to wait until after January 29 to first find out if your return was accepted or rejected.   If rejected, you could make any change and resubmit.  If accepted, that would require waiting on any refund, then preparing an amended return, which can be a hassle.