To be saved you simply come to God by faith, as a guilty sinner, and BELIEVE the Gospel.
You must know that you are a sinner. No man ever got saved who didn't know that he is a sinner. Repentance is that thing when you come before God and see yourself as you are, and see Him as he is, and say with Isaiah “Woe is me, for I am unclean!” Repentance is simply a change of mind, where you admit that you are a woeful sinner totally incapable of saving yourself. Thus, you believe the Gospel (Good News) of the Lord Jesus Christ to be saved.
Perhaps you'd feel comfortable praying a sinner's prayer as did the publican in Luke 18:13... “And the publican, standing afar off, would not lift up so much as his eyes unto Heaven, but smote upon his breast, saying, God be merciful to me a sinner.” It doesn't matter exactly what you pray, because you're saved by BELIEVING, not by praying. But if you'd like to pray as an expression of your faith, you could pray something like this. ...