Qualities of a Good Short Sale!!

[John Thein]

We had a lady call us the other day regarding a short sale. She is 8 months behind, owes $80k, worth $50k....needs work.
She said she called the lender, Nationwide Advantage?, they told her they would do a short sale and to make an offer. Would this be a good short sale deal?
How do we determine that? What do we offer? etc etc
This is our first time dealing with short sales. Thanks

John