You may ask, how can we prepare for it ? when we don't know for sure who went to it, Good question but we know someone who came from it, Jesus Christ. Jesus Christ showed us God the Father. The Bible says as Jesus said Anyone who has seen Him, has seen the Father. But you may say i have never seen Jesus but the Bible contains the life of Jesus on earth as written by Matthew , Mark, Luke and John. So to find out about Jesus we need to have a Bible and read it.
Life is about preparation. We basically prepare for what we want. If we want to live with Jesus then we need to find out more about Him and whatever Jesus loves that we will learn to love, and whatever Jesus hates then we should hate that too.
Does that mean we should not think of the world at all ? Good question, but here is an answer, what we read Jesus did while He was on earth that we should try to do too. But you may say we are not Jesus, true, but again if we want to live with Jesus in eternity we need to start adjusting now if we have not done so, then do not wait long, now is the time.