First, you need to...
1. Articulate a good summary about your career progression so far.
2. Craft realistic post-mba long term and short term goals.
3. How are you going to go from (1) to (2)? Why do you need an MBA for that?
Once you have ironed out solid answers to these questions, start thinking what aspects of a particular program can help you achieve these goals. Why this program and not some other program?
Once you take this approach, you will find many things to talk about which will uniquely "tie" you to a particular program. Does this make sense?
This will also help you ask relevant questions to current students and/or alumni. B-school-09 says, "Hey, I want to manage reptiles in the San Francisco zoo. How can XYZ school help me achieve this? Is there a reptile club ? Are there socials where everyone drinks snake venom ? Did any faculty member recently research the dietary patterns of crocodiles ?".
The over-eager current student replies, "Oh yeah, man! We are totally in to reptiles. Jack and Jane here have been living with reptiles all summer. Let me introduce you to them". And so it begins...