Has anyone got any tips for a 11 year old golfer?

Work on developing an inside/out swing path. Work on getting your hips out of the way as your start your downswing. Most golfers slice the ball because they come "over the top." This happens because they allow their shoulders to turn first in the downswing. At the top of your swing, your first move should be to shift your weight to the left leg (if your right handed). Do this by turning your hips while keeping your shoulders square to the target line. Check your divots. If they are straight down the target line or pointing slightly to the right of the target line, your in good shape. Use another club in front of your feet to help you get square to the target line.