Physical therapist assistant, somehow landed a meeting with the US president of a medical device company. How do I not waste this?

I'm trying to break into medical device sales. I don't want to get too specific, but I hold a certification that's directly related to and required for the clinical side of this industry, and I also regularly "prescribe" these types of products myself.

I cold messaged the president of a company on Linkedin, mentioned my certification, and asked if we could chat. He replied asking where I'm based, what region I cover, gave me his work email/phone number, and said he's out of the country let's set something up for next week. He even offered to work around my patient schedule and CC'd the rep who covers my territory.

I'm hoping to turn this into a job opportunity, but I'm also appreciating it as a learning experience in networking.

For those of you in the industry:

1. What questions should I ask?
2. What should I avoid?
3. Any general advice? I have no sales experience and don't really have to network in my current career.
4. How rare is it for the president of a company to respond like this? Did I just get super lucky?

Appreciate any advice.