Start with Yourself and Work Backwards

This question came to Ask Olive Tree Genealogy today. The answer is so simple I'm jumping Joanne to the head of the queue! 

My name is Joanne Rich (married name)
Joanne Bersane (maiden name)
Bersane name comes from Italy, not sure about married name. How do I find out if ancestors were Jewish

 Joanne - Genealogy research is always done the same way. You start with yourself and work backwards. Gather documentation of your parents, their parents, and so on. Documentation consists of census records, birth records, marriage records, death records, obituaries and more. Ask older family members for details of their births, marriages, places of residence, information on their parents and grandparents, etc

See http://www.olivetreegenealogy.com/beginner/ for more help

Keep going backwards in time, tracing your family ancestry. As you trace back you should discover information on religion and ethnicity of your ancestors.

Lastly, be prepared to spend the next dozens of years researching. Genealogy is not a quick fix. It's not fast and it's not always easy. 

Best of luck!