Rob Lytle was the first player from the university of Michigan to score a touchdown in a Super Bowl. He attended the university from 1973 until 1976.
He scored his first touchdown against Southern Mississippi.
not 100% sure but id say MAYBE john elway?
You have 4 downs in order to either score a touchdown, or advance 10 yards to achieve another first down.
Barry Sanders scored his first NFL touchdown on September 10, 1989.