Your pastor will send it here, to the Office of Canonical Affairs, where it will be reviewed. Once it is confirmed that everything is in order, it will receive a visum est (assent) and be forwarded to the Chancery in the diocese where you are to be married, with a letter granting permission for the marriage to take place in the diocese. The Chancery there will check through the file, attach a nihil obstat (no objection), and send it to the parish where the marriage will take place.