Here are a few instructions, from God Himself, on how to live a Christian life:
Attaining eternal life
Exodus 20:1-17, Deuteronomy 5:6-21 (The Ten Commandments)
Matthew 19:16-19 (Love God and love your neighbor...)
Matthew 6:5-15 (Our Father...)
Matthew 5:12 (The Beatitudes)
That's not so hard, is it?