UCLA One Minute Sales Person Questions

I’m working on a business multi-part question and need an explanation and answer to help me learn.

1. Explain the key elements to address Before the Sales Call.  
2. Explain the importance of preparing and asking the right questions During the Sales Call.
3. Describe and explain the difference between Active Listening and just not talking. 
4. Give examples of how can you demonstrate to the other person that you are Actively Listening.
5. After the Sales Call, what do you think of the concept of using One Minute Praisings?  What does the author say this will lead to?