What is the most efficient and effective way to become a serviceable golfer?

My boss signed me up for a golf tournament next month, and I have never played golf before in my life. He said it's less about actually playing and more about meeting everyone who will be there, but that said I still would like to not embarr myself out there. I know the basic rules and scoring from watching golf on TV and playing video games growing up. But I'm curious to know what opinions are regarding those who are just starting out. Thanks!