Make sure you view this time as a long road, not a jump start. You're asking good questions, and there won't be right answers for many of them. You need to not try to add up how you're going to win your next race -- don't hang your potential on performance at this point. You need to improve and learn, and you'll either start winning or you won't.
A supremely talented beginner may win their 2nd race in spite of all the mistakes, coming across the line dehydrated, wearing sandals and cargo shorts, on a borrowed front wheel, after starting half a lap late and then sprinting for the bell a lap before the finish. Everyone else just needs to fix what they can and pay attention to what's next to fix.