After you've made your stand to say yes to Jesus as Lord, baptism is your next step. Baptism is a public celebration and proclamation of the change that has happened in our lives. In baptism we participate in a picture of what has happened in our Spiritual lives. We are buried like Christ was buried and raised in the likeness of His resurrection. Baptism is part of our journey in becoming more like Jesus. It doesn't solve all of our problems, or remove all of our old habits, but through baptism we become more like Jesus. 

"We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life. For if we have been united with him in a death like his, we will certainly also be united with him in a resurrection like his." -Romans 6:4-5