B.B.
Hold up. He is not even 4. I would just let him have fun and enjoy himself. The teachers will teach him the "right" way to write his letters and his name. You can have him practice or ask for the teacher's input though. You can also ask them to send home workbook pages so he can practice. But right now, it's all about learning is fun and laying the foundation for those tougher times when learning is not fun.