Do:
1.take notes. Personal CRM of contact, specifics like kids, key dates and topic
2.say minimum but say something interesting about yourself.
3. Make mtg w C level to get a feel of where they want to go. Then make mtgs w bottom level to hear where they think they are going without disclosuring your findings.
4. Track personality types.
5. Listen mostly talk minimally.
Gosh, so many things I could dump on this topic as I've burned more bridges then created bc I lacked to do the above.
Ultimately, it's the old adage of it's who you know and not what or how much you know.
Oh one last thing: practice alot of humility.