One thing that was really important for me was acknowledging that my husband was coming into my country, where I was established in my career, had my home, my vehicle, my life, everything. And the key is to make him feel genuinely that all of this is now his too. It can be very easy for your newly arrived spouse to be overwhelmed by you being so settled and feel almost like a guest in his/her own home. From day 1, let them make decisions, take charge of certain things, and don't you go off making decisions without them. Truly building a life together is beautiful, but it takes work. Put pride aside and just focus on each others' needs. As others have said, communication is key. Let the small things go. You can't win them all, so decide what's worth really fighting for. Your newcomer is gonna make some mistakes, let em learn from them, it's ok.
Everyone's gonna tell you that now he/she is here, "the honeymoon is over" (people somehow believe that being apart is super easy). They'll tell you that all the sweet things you had while you were apart are gonna end. Please ignore them. Yes, it is a huge change, but it can be the most beautiful change of your life if you make it to be. And all the closeness and cutesy things you had while apart certainly don't have to end! You worked hard for this reunion, don't let anyone turn your blessing into a curse!