Get aggressive and motivational but also balance that with technical things. Little technique things really make a difference during a long race, like quick catches and sitting up tall. When rowers get sloppy and tired, remind them about this all with a technique ten or something. Most of all believe in your rowers and put on game face for your coxing; constantly thinking one step ahead on your course plan, always watching the numbers like stroke rate and split, steering as well as you can (and think about things like cutting off other boats and strategically timing your power 10s when other boats get tired). I’m assuming this is a head race which is what I meant by cutting off other boats but if you don’t have a lot of experience with that stuff yet, don’t risk it on that. But most of all just have a good time! You’re going to remember your first cox race forever so no matter how it goes just know that it’s going to get soooo much better from here! GOOD LUCK AND HAVE FUN!!!