John Piper has a post that includes a list of helpful questions to ask as one prepares for marriage. He writes:
In each of these sections one item could be added that I have not listed, namely, How do you handle and live with differences? How do you decide what can remain differences without jeopardizing the relationship? So as you deal with each subheading, include that in the discussion.
Here are the sections: theology, worship and devotion, husband and wife, children, lifestyle, entertainment, conflict, work, friends, and health and sickness. Read all his questions.