In the United State “Esquire” is a title used when corresponding with a member of the legal profession. The correct form is “Richard Kochs, Esq.” You never use both the honorific “Mister” with the title “Esquire.”
In the United Kingdom “Esquire” is a title used for men who have no other, more specific title to use, but are still recognized as being of a better class than the rest of you slime.