How to instill leadership since young?

I would say to help your child build confidence in his/her abilities. Always affirm his/her efforts and be generous with praises when he/she does well. Also, giving him/her opportunities to problem solve and make decisions may help. Whether or not a child is inclined to take on a leadership role is probably dependent on his/her character. That being said, I believe leadership skills could be picked up and would be useful as the child grows up. You can try role-playing or enrolling a child into camps to help him/her pick up some leadership skills in a group setting.