Bank Owned Properties, how to proceed?

[Agnes Fox]

Recently I made a contact with someone who has access to Bank Owned properties. However, I am not sure how to approach the subject without making some stupid mistake. I don't want to burn a bridge. 

So before I start a conversation, I am trying to learn as much as I can on the subject. Is there a rule of thumb of how to present an offer to the bank and how much? Some of the houses are over $400k marker value but only $2000 owed to the bank... What should I do?  Is there a form to use to submit the offer? WHo do I talk to at the bank?