The most important thing to realise is that we cannot save ourselves - only God through Jesus can save us. Salvation is God's work. A good prayer to say would be: "Lord Jesus, I have done many wrong things and I ask for your forgiveness. I believe that you died for my sins and that you rose from the dead. I turn from my old way of life and I invite you to come into my heart and life as my Lord and Saviour. Help me to walk in your footsteps daily by the power of the Holy Spirit. Thank you, Lord, for saving me and for answering my prayer. Amen"