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How do i find mg lost Z1 using IMEI number
Hi @stormchaser, so sorry to hear about this. 
As @uliwooly wrote, we have no way of finding your phone using the IMEI number.
If the phone still is powered on and have an activate network connection you can try using Google Device Manager or the MyXperia service to locate your phone using your Google account.
Do note that the MyXperia service must have been activated in your phone prior to it being lost.
I would also recommend that you get in touch with your service provider and the police so they can block the phone from being used with a SIM card if you can't find it.
I hope that helps!