The most important thing that can happen to you is asking Jesus into your heart.
It's as simple as ABC...
Admit that you have sinned.
"For all have sinned and fall short of the glory of God." Romans 3:23
Believe that Jesus died for you.
"God demonstrates His own love toward us, in that while we were still sinners, Christ died for us."
Confess that Jesus is Lord of your life.
"If you confess with your mouth, 'Jesus is Lord', and believe in your heart that God raised Him from the dead, you will be saved. It is with your heart that you believe and are justified and it is with your mouth that you confess and are saved."