You have a lot of questions. Perhaps the best way to answer your question is to give you some of the benefits and possibilities of cloning.
On account of advancements in medical technology, cloning is possible. There are, of course, ethical dilemmas, but the technology is growing. When it comes to benefits, first of all defective genes can be eliminated, because healthy genes can be cloned. This would be a huge breakthrough in research on any genetic disease. Tied to this thought, organs can be cloned as well. This is another medical breakthrough.
Second, cloning cells can help people who have experienced any injury to heal much faster. This could apply to a wide range of injured people, from someone who hurt his or her rotator cuff to someone who is paralyzed due to an accident.
Cloning may also promise to cure infertility. Think about cloning to create a younger version of a mother or father. This could help a couple who cannot have children in a dramatic way.
To think on a more radical level about the idea of cloning gifted people. For example, what if we could clone Albert Einstein or Beethoven?