Get started with these sites. You may look for other reliable sources.
Carbon Copies: Cloning
http://www.factmonster.com/ipka/A0906940.html
http://www.genome.gov/25020028
Cloning Milestones
http://www.factmonster.com/ipka/A0193002.html
Why Clone? http://learn.genetics.utah.edu/content/tech/cloning/whyclone/