If you are using a blank sheet of paper folded in half, begin at the top of the outside fold, then continue at the top edge of the inside.
There are four panels, and it can be confusing for a reader to follow writing that hops from one side to the next.
If the card is presented to a professional, the woman's name also appears first, even if the couple isn't married, or the wife has kept her maiden name.
Our marriage advice to you: Remember, no matter how hard it gets, the first 50 years of marriage are always the hardest.