We are getting married in a few months and I want to actually be ready, not just show up on the day. What should I be doing now?

“Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.”

This line closes the creation account and is Scripture's foundational description of marriage: a leaving, a joining, and a becoming one. The leaving comes first, which mattered enormously in a culture built on extended households and still matters in different ways now. Marriage reorders every other loyalty you carry, and that reordering is work you do over years. The wedding itself does not accomplish it for you.

“With all lowliness and meekness, with longsuffering, forbearing one another in love; Endeavouring to keep the unity of the Spirit in the bond of peace.”

Paul writes from prison to a church made up of people with little natural reason to get along, and hands them the unglamorous skills that keep a shared life intact: humility, patience, putting up with one another, working at unity. He simply assumes friction is coming. Wedding preparation tends to focus on one day, while this passage is about the ordinary machinery that carries a household through decades.