This is not an exhaustive list but merely some thoughts on the content of a Christians prayer as we look at the Apostle Pauls example in Acts and Ephesians.
Prayer Should be:
God Centered
Trinitarian
Reverent
Worshipful
Thankful
Thoughtful
Confessional
Repentant
Relational
Intimate
Kingdom Minded
Missional
Intercessory
Intentional
About Listening as well as Speaking
Specific
Simple
Spirit FilledCorporate
Continual
Confident & Expectant