First ever warm call, how should I go about this?

Probably gonna sound super antisocial w this post but I'm nervous and need all the advice I can get.

I managed to schedule a call with an alumni from my school who works in BB, which is impressive on their part considering we're very much a non target and honestly a well known party school. I know generally the topics range from answering questions such as why you chose banking and generally just letting them talk about themselves, but I'm wondering where I should try to lead the conversation? I've basically stalked this persons entire linkedin, but I'm wondering if I should allude to the fact that I know their whole entire work history and should ask them direct questions about it, or if I should just let them lead the conversation. I've seen a lot of good info on here on what to talk about, how to reach out for a 2nd or 3rd call, but I'm wondering how much I should allude to in terms of my knowledge on their work history. Out of all the emails I sent this was the one I expected a response out of the least, coupled with the fact this is my first ever warm call I'm pretty nervous.