How to Speak English With Confidence

I was between the ages of 12 and 13. They wanted me to speak for children's Sabbath. My uncle sat me down and we went through what I was going to preach about the sermon. We spoke about my posture walking up to the front, standing in front of four to 500 people and speaking with confidence. And I remember I walked up on that pulpit. I had my notes ready. People said afterwards that it was amazing. It was a blessing.