Forget that you’ve already memorized the “coffee's for closers” speech from Glengarry Glen Ross. Building and growing a successful startup sales team is all about metrics. Successfully managing a team comes down to a lot of number-crunching. This took me by surprise. It turns out that nearly all of the major responsibilities of a sales leader - everything from setting goals to measuring performance - requires a good understanding of which sales metrics are most important and how to use them.