a16z GP Andy McCall on advice for starting a sales career, and the hire founders wait too long to make: "I made this mistake early in my career. I was chasing where can I make the most commission... At the end of the day, none of that matters." "You want to find the great company that's gonna grow. It's like a career elevator. You will grow with the company. You can't let your ego get in the way." "Sales operations is probably one hire that I see companies waiting a little too long on." "It…