Think about it. It means a new start. When you accept the salvation the Lord gave you, then you become a new person. You decide to let the Lord change you into a better person and to take you from your sinful, lost state into a new creation. God will work wonders in your life if you let him.
Faith is the key.
It is that simple. You are saved by faith, and faith alone , but what you do after you believe, and are saved, is also very important. The short answer is that we are not under the law, so we are not bound by it, we are under grace. The law is useful for instruction, but we aren't required to keep it. The Law was given to the Jews only.