Service is about serving God to the full and knowing how to do what He wants you to do. If you call yourself a Christian then act like a Christian is suppose to; do what a Christian is supposed to do. A true Christian is meant to be a representative of Jesus, who is the Christ, on Earth to a needy people; in other words, to be a Jesus to those in need. The word Christian as given in Antioch (Acts 11:26) means little Christ or many Christs.
Jesus lived God's will in front of us--we read about His life--now it is up to us to follow His example and live God's will in front of all people, not just the believers but the unbelievers as well. After all, if we don't do it who will? Think about it this way; If you don't do it who will?