You should wait for all your tax documents before you file your tax return.
You cannot file income tax twice. But if you filed an original return and you found any mistakes or ommission later, you can amend the tax return by filing Form 1040X.
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Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.