Have you got any tips on being married? - Haarfindelwe
Not many no, some of the ones I do have include being married to a dragonborn or how to be married and still be an adventurer. So I don't think they'll be of much help to you.
The few I can think of that don't include this are really just common sense. One of them is that every marriage has its bumps and times it seems difficult, despite how perfect a marriage may seem, the people behind it will likely be having occasional arguments about the big and the little things.
Also don't let small arguments damage your relationship, one of you will apologise in time it doesn't matter how stubborn either of you are. If you truly love each other you would never let something small damage it. (in mine, lately its been me but normally it could be either of us, even though we're both stubborn)