I need to issue a plate for my new vehicle .
Is this word appropriate? i need more offical term
I'm not sure how official it needs to be. You obviously need a plate for your new vehicle, in any words.
Perhaps, "I wish to apply for a licence plate for my new vehicle".
"Please supply me with a licence plate ..."
That would be okay in writing.
But speaking, you'd say "I need a licence plate for my new car, please".