Congratulations!! It is a very special time for you...enjoy the moment! First, I would write down the reasons you are marrying that person and examine if they are the right reasons. My first marriage was a 17 year nightmare because I married for all of the wrong reasons. Marriage number 2 is wonderful because I was careful to look for the right characteristics. I think a BIGGIE is that the person is kind and patient. Not super religious now, but 1 Corinthians gets it right in my opinion.
1 Corinthians 13:4-7New International Version (NIV)

4 Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5 It does not dishonor others, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6 Love does not delight in evil but rejoices with the truth. 7 It always protects, always trusts, always hopes, always perseveres.