Prayer will be heard with greatest effect when it comes spontaneously from the heart and soul expressing in your own words your desire to help others or to become a more spiritual person.
Do not pray for material things because God has already provided what you need. Do not pray for elevation of your earthly status, for it counts for nothing in the spiritual realm. Rather, pray for elevation of your soul through your expression of love, compassion, and service.
You might like to see the discussion of prayer that appears on pages 76-81 in The Teachings of Silver Birch, edited by A.W. Austin.