And how would I do in case I don't remember my license plate number?
provide your DOB name and date of birth as well as vehicle make and year
And what other things do I have to submit with my application?
a photocopy of your driver's license or other government-issued photo identification card as proof of identity  a personal check or money order made payable to the "Commissioner of Motor Vehicles" to pay the search fee of $ 10.00