Law and Grace

There are those that say you must follow the Law of Moses in order to obtain salvation in God’s Kingdom, and there are those that say all you need to do is believe in God’s Son, Jesus or Yeshua (Yeshua is His Hebrew name) in order to be saved. And there are some that say the Law of Moses has been abolished or ended. What do James and the Apostle Paul have to say about it? How is one saved?