1. Learn how to be resilient, especially if you have kids. A LOT of the time you will be solo parenting, and frequently it will be unplanned. Dinners will be served hot and having given up waiting for him to join you, glad wrapped cold, to be eaten when you have long gone to bed. The dinner/bath/bed routine that you were counting on him helping you with will have to be done alone. AGAIN. Try not to be resentful. Its hard, but the call-outs outside of rostered hours are part of the job and you need to expect them and get used to parenting alone. His job involves putting others needs ahead of yours.
2. Be adaptable. Trust me, that planned weekend sleep-in that you have had marked on the calendar for the past month will ALWAYS come after a 2 a.m. callout and your spouse won't even be HOME to get up with the kids. The Mother's Day picnic you had planned as it fell on his RDO? He will get a call-out to your neighboring town just minutes before you head out the door as a family. Christmas is a tough one. Usually they are rostered on for at least a few hours during the day, but your day can be planned and executed successfully and callouts are rare.
3. I highly recommend having a Routine. I am up at 7 a.m. each morning with the kids and I am responsible for getting them school-ready whilst I leave hubby to his own devices for work. Regardless of his roster, I prepare dinner for the entire family at 5pm every night. If he isn't home then his gets wrapped. The boys go to bed at 730 p.m. every night. We do this because even if your police spouse SAYS they will be home, you cannot rely on it.
4. Realize that your actions/opinions all affect your spouse by connection now. I try very hard to monitor what I say on public social media with regard to any polarizing opinions I may have, as people may assume my opinion as his. Police officers must be impartial in their dealings with the public and I would loathe for anything I say on social media to come back and bite him on the arse.