Check out 23andme.com
This site is really cool and will explain how to buy a kit to send in a saliva sample that they run through a DNA mapping. After your sample is processed you can see where you ancestry is from by percentage, your health risks for certain illnesses, and lots of other markers they identify. By lots of registered people taking their quick surveys, they have been able to figure out what genes do what. Really cool for around $200. Plus you can connect with people related to you that are on the site.