Tomorrow is not promised to any of us, but by God’s grace you have been given today.
God has promised that if you confess with your mouth Jesus as Lord and believe in your heart that God has raised Him from the dead, you will be saved, Romans 10:9
Any prayer from your heart will do. Just acknowledge that you are a sinner in need of a Savior; believing in faith, and accept in your heart, Jesus as Lord of your life from this day forward. He will hear you and you will be saved.
For the word of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God, 1 Corinthians 1:18
But God demonstrates His own love toward us, in that while we were yet sinners, Christ died for us. Romans 5:8