Golf beginner. Playing golf with customers next week. Advice?

I (31M) have played one round of golf in my life, and some Pitch & Putt as a teenager. So I am not a total beginner, but not far from it.

Next week I have a meeting with customers and they suggested a round of golf. What are some basic tips that will get me through the round, as well as some do's and don'ts around the golf course?