Generally, people use contemplative prayer before the sacrament - in other words, just be in the Lord’s presence and contemplate the Eucharistic mysteries and be in awe of the power of God.
However, many of us can be quite distractable and get caught up in our own thoughts. In order to help me, I tend to bring my rosary along and pray the rosary and Chaplet of Divine Mercy. Other than that, I think anything that helps you meditate on Jesus is fine.
