Heaven and Kingdom of God, what's the difference!

What is the difference between heaven and Kingdom of God? why were Adam and Even sent away? was it punishment or an act of mercy in fact? do expect to work later in this kingdom of God? what is the real purpose of our life now? Are we better than Angels? Can we communicate later? do we recognise our beloved ones? Is there really heaven and hell or is it only our perception and feeling and understanding of God later? and many other questions that need answers based on the Bible!