When you join as a married couple, your credit history and debt repayment records will be joined as well.  If one of the pair has a great credit history and the other has a few glitches, it is wise to prepare by:

• Try to keep the party with the good credit debt free.  You may need that good credit to qualify for the size mortgage that you want and need.
• Work on the credit glitches now by seeing a good mortgage consultant.  They will tell you what steps must be taken and when in order to get that good home mortgage with the good interest rates.
• Avoid making large investments or running up new debt when planning to buy a new home together.  Probably, you both don’t need a new car.