I would suggest that you do some basic research on the subject, starting with:
“Mapping Human History: Discovering the Past Through Our Genes” by Steve Olson
"Genealogy 101" by Barbara Renick and
"Trace Your Roots with DNA: Using Genetic Tests to Explore Your Family Tree" by Megan Smolenyak Smolenyak and Ann Turner.
After that, despite what other say, log into www.familytreedna.com
and see what they have to say. Their site provides basic DNA schooling.
Also, please consider all those TV shows such as CSI, NCIS, et al. Whilest those shows do not accurately portray how involved and time intensive DNA research/searches are, they are based upon scientific analysis of DNA.
Your DNA will reveal if you have red, white, black, yellow, or brown-skinned ancestors. It will reveal if any of them were Sephardic or Ashkenazi Jew; whether your ancestors were Eskimos or Innuits or Saami, etc., etc., etc.
Finally, I might point out that the scientist who discovered that DNA was different for males vs. females, whites vs. blacks vs. browns vs. yellows vs. reds was a black man. He is still considered the world's foremost authority on using DNA to see where you came from; your DNA will tell him if your ancestors came from Northern Italy or Southern Italy, whether their ancestors were Jews, blacks, or whatever.
So, read up!