According to the Newcastle chronicle he signed a "long term" deal in March 2014. Given he was 17 it wouldn't surprise me if it was 4 or 5 year deal, so probably has another 3-4 years left on it.
Sent from my iPhone using Tapatalk - so please excuse any spelling or grammar errors
A striker only needs one shot to score a goal. It is the best position for a young player to be in. It is defenders that don't get away with lack of experience. A striker just loses the ball.
I am not saying that he would be a top scorer at his age. But he would certainly score goals.