Let it be (B)eautiful: When you visit your partners family for the first time always try to bring something, even if its small. If your partner is of a different ethnic background it would be nice to bring a treat or dish that is typical from where your family is from. You want to bring a piece of you into their home.
Let it be (A)uthentic: Your mistakes from past relationships should never be repeated. They happened during the practice round. Now that you are in the real thing you want to make sure you play the game right. So take those lessons you learned and apply them to your current situation. Remember how you and your ex partner felt and work to avoid those feelings again now.
Let it be (D)etermined to Last: You and your partner should be on the same page when it comes to plans of living together, marriage, kids, a dog, buying a house, whatever. If your partner is dead set on NOT having a child and you want nothing more than to be a parent it may be in your best interest to re-evaluate if your relationship is really going to work. This is different from you wanting a child at the age of 21 and your partner wanting to wait till you both are a bit older. This involves compromise not re-evaluation. ;)